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Honda Civic Real World MPG

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  • ruking1ruking1 Member Posts: 19,826
    Actually not far off from the SWAG. :) For planning purposes, I would yield to publications who have actual experiences. I was just dialing in the app 450# difference between the two vehicles.
  • ruking1ruking1 Member Posts: 19,826
    A number of points: 1. The 15 in wheel and tire(if that is a possibility) would be even better 2. Cheaper would be another advantage 3. I am sure it is at least an H rated tire. 4. I am guessing the Civic TCI would be a 6 speed manual.
  • themistoclesthemistocles Member Posts: 95
    i was curious about those additives you put in your gas that supposely give you better gas mileage and clean your engine. i was askin the people at schucks, and they said none of em work except this stuff called lucas. so decided just to try it out since it was on sale (3 bucks a bottle). anyway, in my Si, ive got 200 miles on this tank already with a mixture of city/freeway, and not quite halfway through the tank.. this definitely going to be the most ive gotten on a tank.
  • ruking1ruking1 Member Posts: 19,826
    I personally would not used them on a regular basis. It is a bit of a shell game. If you paid 3 bucks for a bottle (tell me how many oz are in a bottle) of unleaded regular instead of the additive, would you get better mpg? Which now would be cheaper/more expensive, 3 dollars for a gal of gasoline or 3 bucks for a bottle of additive.

    Having said that, I do use periodically (50,000 miles)Chevron Techron, as sort of an "Italian Tune Up".
  • eldainoeldaino Member Posts: 1,618
    oh wait, tci. that sounds better. i don't think vw would approve of the use of their badging.

    the 2.2 isn't turboed in the civic right?
  • pulgopulgo Member Posts: 400
    Yes it is. Without turbo charging it would be very difficult to extract 140 HP out of a 2.2 liter diesel.
  • ruking1ruking1 Member Posts: 19,826
    Yes it would appear so! Also from the reading, it seems the Civic is turbo, common rail. So if I read these things right (no real matter, it is what the oems call it anyway) TCI would stand for Turbo Common (rail) Injection?
  • themistoclesthemistocles Member Posts: 95
    oh i know, i was just curious about it, obviously not going to keep buying it and using it. Supposely it cleans your engine, i highly doubt it does much, says some crap about cleaning the cylinders and what not. anyway, i was just curious if it actually worked, which seems to actually do alot more than i thought. if i get over 400 miles on a tank of gas in a Si, id say thats pretty damn good. its like 3.20 for gallon of gas here(premium) and its been up to 3.50 or more.
  • drmbbdrmbb Member Posts: 80
    I can get over 500 miles per full tank in my EX/AT sedan, but that is with regular gas at $2.89/gal. So with a 30-cent price per gallon difference (based on your costs - even premium hasn't broken $3.05/gal in my area, so about a 10-15-cent difference for me), does the mileage in the Si really near-equal that of the EX, in terms of cost? My best single trip highway cruising mileage in the EX so far is just shy of 41.5mpg (70mph, cruise control, A/C on).

    The guys at car talk also mention using regular gas in high compression engined cars, like the Si, and just letting the knock sensor adjust ignition to compensate for the lower octane? I wonder if that's really a safe way to get the benefits of cheaper gas in an Si? ("safer" as in safe for the longevity of the engine).
  • shiposhipo Member Posts: 9,148
    The guys at car talk also mention using regular gas in high compression engined cars, like the Si, and just letting the knock sensor adjust ignition to compensate for the lower octane? I wonder if that's really a safe way to get the benefits of cheaper gas in an Si? ("safer" as in safe for the longevity of the engine).

    Klick and Klack are funny but don't always give the best advice. Running Regular fuel in a Civic Si is a "Fools Economy". Why? By letting the ignition system retard the timing so that the engine won't self-destruct on Regular fuel, your fuel mileage will go down to such an extent that it would have been cheaper to burn Premium fuel.

    Best Regards,
    Shipo
  • ruking1ruking1 Member Posts: 19,826
    ..."Supposely it cleans your engine, i highly doubt it does much, says some crap about cleaning the cylinders and what not. anyway, i was just curious if it actually worked, which seems to actually do alot more than i thought. if i get over 400 miles on a tank of gas in a Si, id say thats pretty damn good. its like 3.20 for gallon of gas here(premium) and its been up to 3.50 or more. "...

    By your (quote) last response, it would seem the answer did not really address your concerns. It would be highly unlikely a brand new engine, (such as yours) would need cleaning.

    In so far as a so-called "mileage booster", you are paying FAR more for the so-called (additive) "mileage booster than you would for a gal more of fuel.

    How much more? Examples: Chevron Techron, 16 oz @ 2.50-5.00. At 3.15 per gal unleaded premium, the same money will buy .79-1.59 gals. To carry that out, @38 mpg that would add 30-60 miles more!!! How many more mpg truly can 16 oz of additive add!!?? So even if the additives have the same (BTU) energy as unleaded regular, (it does NOT) the most you can get is 4.75 mpg (for the same monies)!!!

    So you are MUCH better off buying the fuel until those intervals (50,000-100,000 miles) where you might determine the engine would most likely benefit from so called cleaning.

    Since I do not tear down the engine/s to really see if it REALLY needs the cleaning additive, and take it apart again, (after it runs the additive) to see if it really got cleaned; additive use defaults to a more of a "feel good" preventative measure. I might add, with very questionable results :(:)
  • shiposhipo Member Posts: 9,148
    "Since I do not tear down the engine/s to really see if it REALLY needs the cleaning additive, and take it apart again, (after it runs the additive) to see if it really got cleaned; additive use defaults to a more of a "feel good" preventative measure. I might add, with very questionable results."

    FWIW, I DO pull engines down and have a look-see every now and again. My most recent example was a 1998 3.8 liter V6 engine from a Dodge Grand Caravan, and you know what I found? To make a long story short, I didn't find even a spec of dirt, varnish or other crud in the portion of the intake system that sees a mixture of both air and fuel.

    Look at it this way; from the moment the intake air passes through the air filter, it needs to travel about 18" before it reaches the throttle butterfly. From there both the PVC and the EGR systems dump their nasty exhaust fumes and blow-by gasses into the intake plenum. Once the (now polluted) air has made it past those obstacles, it oozes along the intake plenum (gunking and varnishing as it goes) and into the intake manifold (maybe a little over a foot in distance) where it (finally) enters the fuel injection spray zone, which is literally not even two inches before the intake valve. It is within this zone that the additives in the fuel (those put there by the distiller and those added by the driver) do their job of cleaning the intake system, all one inch or two of it.

    So, back to the engine that I just tore down, within the spray zone, the intake manifold was completely spotless and glittering in even low light. What's interesting here is that I've simply used name-brand gasoline in this van for its entire life, all 145,000 miles of it. So, if the intake manifold is so pristine, why on Earth would I want to add any "fuel system cleaners"?

    As a point of reference, just above the fuel spray zone, and all of the way back up to the throttle body, the entire intake system was caked with a coat of varnish that was probably about 1/64" in thickness, and while it was soft enough to allow me to nick it with my thumb-nail (barely), it was VERY resistant to cleaning. So what did I do with it when I reassembled the engine? Not a damn thing. ;-)

    Best Regards,
    Shipo
  • ruking1ruking1 Member Posts: 19,826
    And, there you have it! :)

    Also since we are on a Honda specific thread, Honda's notoriously run VERY clean on the outside, (emissions) and specifically on the inside.

    So while individual circumstances do in fact vary. I am at total comfort running 20,000 mile OCI's (with a filter change at that interval also) with Mobil One 0w20 (5w20 also). The Civic gets 38-42 (been hitting a couple of 43 mpg tank fulls (10-11 gal fills), during an everday plain jane commute. (27 miles each way) It is at app 50,000 miles and I have yet to run Chevron Techron, and indeed do not have a 4 pk stocked. :) I might hit the edges and go 100k before I think about it again. :)
  • shiposhipo Member Posts: 9,148
    Agreed. If a Honda Civic does end up in my garage, my bet is that the fuel system will do an easy quarter of a million miles without so much as a fuel system additive ever coming anywhere near the fuel tank. ;-)

    Best Regards,
    Shipo
  • themistoclesthemistocles Member Posts: 95
    lol, man... all i was saying was i wanted to try it cause i wanted to see if they actually did anything.. i never said it was the better way to go or cheaper to use than just buying gas. i was pleasantly surprised it actually was noticeably different.. i would suggest it to someone using regular gas in a car that has more miles. come to think of it tho, lots of times i get 300 miles with 11 gallons of gas, which is 27 miles to the gallon.. if i get 400+ miles with 11 gallons of gas using this additive crap, its definitely worth it..
    im going to have to try it in my girl friends civic, see how it does. and yea, i was only saying what the product claims to do about cleaning the engine. I NEVER said i was buying it to clean my basically brand new engine....... they also claim that you dont need to buy premium gas when using the additive, but i decided not to add that in since im sure id get more scrutiny just for saying what the product claims(and i sure as hell dont put regular in my car.. or arco).. lol :P

    by the way ruking you totally mis understood what i was saying.. i have no concerns with my car or anything, i was merely talking about the product i tried, and maybe suggesting it to someone else to try there results, especially if they have a higher mileage car...
  • ruking1ruking1 Member Posts: 19,826
    That 5 mpg difference you cite (as you might surmise, (in my case 38-43 mpg)) can be just do to normal variance, and with no additive!!! :).
  • themistoclesthemistocles Member Posts: 95
    ive never gotten an mpg like that, and ive done some spirited runs on this tank too.
    but anyway,

    To anyone ELSE, if you got higher mileage and just want to TRY it and compare results, id be interested. its called lucas i believe. its just a additive you put in the gas, claims to give better gas mileage, clean cylinders and injectors. I havent finished this tank yet, so ill see how i do in the end. i was always against putting additives in the gas tank, but i heard this was the only one that worked from the people that worked at schucks and a couple technicians from my honda dealership.
  • shiposhipo Member Posts: 9,148
    I've held my tongue on this discussion so far but this is just too much. There is NO WAY any fuel additive is going to add 5 mpg to the fuel economy of a Civic. Ain't happenin'.

    The simple truth is that buying fuel additives (beyond those already in your fuel) is a waste of money and if anything will REDUCE your mileage. If someone wants to claim otherwise, then they're going to have to offer FAAAR more scientific proof than the mileage from a lousy couple of tanks of gas. :P

    Best Regards,
    Shipo
  • ruking1ruking1 Member Posts: 19,826
    Yes, I think anyone can prove this to themselves. Since I used the example of 16 oz of additives, you might want to ask what is 16 oz/128 oz in a gal= 12.5% of a gal. So all one needs to do it use 16 0z of additve per tank (or the recommended dosage rate) get the mpg and for the next tank add in 16 oz of gasoline. My swag is you will get better mpg adding 16 oz extra of gasoline! So if one gets 38 mpg, 12.5% would be 5 miles better. The cost will be expotentially lower 12.5% (16 oz/128 oz per gal) of 3.15 per gal=.39 cents vs 3.75 for Lucas (16 oz) 7.49 for a 32 oz bottle of Lucas. (that is 30 per gal)
  • themistoclesthemistocles Member Posts: 95
    well, maybe you should actually try it before you say all that. obviously your not going to. so im talking to the people who might be curious. I always thought they were bogus too, i just decided to try THIS BRAND once. i was asking the other people who might want to actually try it and see there results. i dont need to hear a buncha people saying its not going to work and what not,especially when you havent tried it. theres been an obvious difference in my mileage, so i really dont care if you say its impossible, lol..
    anyway, im not saying it is or isnt the better way to go.. obviously im not going to put a bottle of this in everytime i fill my tank up. and especially dont buy it if your paying more than 3 dollars a bottle.. it was on sale here for 3.00
    like i said before, im asking if someone is willing to try it in there car that has higher mileage, preferably a regualr civic to share there results with me. majority of people dont think they work at all, so dont bother just posting to say it wont work. also remember i said that i dont think any of em work except maybe this kind.. anyway.. peace out. (somehow im guessing no ones going to try it, all well) this doesnt seem like a big deal to me, but i guess others...
  • ruking1ruking1 Member Posts: 19,826
    ..."like i said before, im asking if someone is willing to try it in there car that has higher mileage, preferably a regualr civic to share there results with me. majority of people dont think they work at all"...

    Judging by the silence, I think you are the most likely candidate. :)
  • themistoclesthemistocles Member Posts: 95
    lol yea i came to that conclusion along time ago... all well. no one has a open mind to try new things :P
  • ruking1ruking1 Member Posts: 19,826
    I am open to you trying it and reporting the results. I already have given you a pretty good swag. :)
  • shiposhipo Member Posts: 9,148
    Dude, a couple of tanks of fuel, especially in completely uncontrolled conditions is so far from scientific proof that it is laughable. Face it, you cannot even explain what that stuff did (or didn't did as the case may be) to your car to allegedly allow it to see such an improvement.

    The sad truth of this type of thing is that so many times folks want to prove to themselves that they spent their hard earned money on something that's going to give them a return on that money. As such they unconsciously drive easier and magically get better mileage. In reality, if they had been honest with themselves, they would have simply driven just as easily with their untreated fuel and gotten as good as if not better mileage. Like it or not, there's even a name for this, it's called the "Placebo effect". It's well known and well documented, in fact, it's even well documented right here in Edmunds. Check around if you don't believe me.

    Here's a few links if you're interested:
    http://www.skepdic.com/placebo.html
    imidazol97, "Toyota Camry Real World MPG Numbers" #269, 15 Jul 2006 7:28 am
    http://www.mlm.com/mlm/user/viewthread?thread=9728

    Best Regards,
    Shipo
  • themistoclesthemistocles Member Posts: 95
    well now im going to have to spend 9 more bucks and try 4 tanks with and 4 tanks without and see what happens since no one else wants to spend 3 bucks and try it :P lol yaya im no scientist, i got consistent driving route i do that is a mixture of highway/city that should be accurate enough.
  • ruking1ruking1 Member Posts: 19,826
    Well you don't really have to try it! But right away you have gotten off on the wrong (experimental) foot. :) You have to put 4 tanks with additive and 4 tanks with unleaded gas (as the additive placebo.) But now you need someone to give you the unknown product, so in effect you do not know which product you are really running. :):(
  • shiposhipo Member Posts: 9,148
    "i got consistent driving route i do that is a mixture of highway/city that should be accurate enough."

    Absolutely, positively no chance of that. Even if you drove for one hundred tanks of gas you still wouldn't prove a single thing. Until you prove in either a lab or say with a number of identical cars on a closed course with electronically governed speeds, you have no proof, much less any compelling evidence.
  • themistoclesthemistocles Member Posts: 95
    lol shipo, my lord... just drop it if it means that much to you... i dont give a crap what you think, all i was doing was JUST TRYING IT. all i said was i noticed a difference. im not here to say its some wonder fluid you put in your tank that will give you a shitload more mpg...

    "he sad truth of this type of thing is that so many times folks want to prove to themselves that they spent their hard earned money on something that's going to give them a return on that money. As such they unconsciously drive easier and magically get better mileage"

    lolol, thats not at all what i was thinking. first of all, i didnt even buy my car for fuel efficiency, that was a bonus. i didnt buy this fricken additive thinking i was going to get better gas mileage.. i didnt think it was going to work at all. second of all ive been hammering it a bunch in the city, flooring it like any other gas tank..lol just boggles my mind "trying to make myself think it works cause i spent my hard earned cash on it" lolol, yea damn... im so mad i spent that 3 dollars on this bottle..... lolol anyway, what ever. im done talking about this. frankly i dont give a flying [non-permissible content removed].. all i said was i tried it not thinkin it would work, i just happen to ask about it when i was buyin my new air filter, i noticed a difference, decided to ask if someone else would try it see what they think..
    anyway, i guess thats too much to ask. SO FORGET IT... lol my lord...
  • ruking1ruking1 Member Posts: 19,826
    Since we are on the Honda real world mpg thread, that is the reason why I report a range of mpg for a pretty standard commute. (door to door, 38-42 mpg) However the last three tankfuls (10-11 gal fills) have been such; 38.6,43.2,43.4. So the average mpg (last three tankfuls) has been 41.733333 mpg.
  • patpat Member Posts: 10,421
    Okay, let's not make this into something personal. You made a post asking others' opinions and you got responses. Understand that others here are free to comment (in a civil manner of course) on your posted thoughts. If you disagree, certainly that's fine. No need to take offense over differences of viewpoints.
  • themistoclesthemistocles Member Posts: 95
    very nice :D good ol civics. I love my Si :) and loved my civic lx i had before my jetta
  • shiposhipo Member Posts: 9,148
    "lolol, thats not at all what i was thinking. first of all, i didnt even buy my car for fuel efficiency, that was a bonus. i didnt buy this fricken additive thinking i was going to get better gas mileage.."

    It's comments like that that make me really wonder of you do in fact have a horse in this race. Go check over on the "Fuel and Oil Additives" topic and see how many shills have made almost identical comments to that one.

    FWIW, I've had the same very repeatable commute for the last two years, 50 miles each way (47 on the Interstate, on cruise control); reverse commuting, light traffic, two traffic lights to the office, one on the return. During that time I've tracked my mileage tank by tank which works out to some 50,000 miles. The fuel economy for my worst tank was 19.4 mpg and 25.9 mpg was my best, while my running average over that time was 21.485 mpg. So, what caused the 19.4? No clue other than that it was below zero outside. What caused the 25.9? Equally no clue other than it was over ninety outside. What does it mean for my fuel economy? It gets better in the summer. Earth shaking.

    "i just happen to ask about it when i was buyin my new air filter, i noticed a difference, decided to ask if someone else would try it see what they think.."

    I surely hope you're kidding as there's no way you'd notice a difference with a new air filter unless it was REALLY clogged, and even then most likely only at wide open throttle.

    Best Regards,
    Shipo
  • themistoclesthemistocles Member Posts: 95
    Certainly respect that Pat. a simple disagreement woulda been a lot easier, rather than saying i suffer from the placebo effect, lol, which is the total opposite. Anyway, im not trying to argue with him about this, absolutely pointless. anyway, ill just report what i find with a few tanks on my car and friends. Maybe someone else would be willing to try it? hehehe
  • themistoclesthemistocles Member Posts: 95
    lol... no im not saying i noticed a difference with the air filter. im talking about the additive, i noticed a difference in mpg with the additive, just worded it wrong.. i meant that i didnt just go to the store looking for additives, it was just a accident that i happen to pick it up. so can you get off my back please. all i was asking, was someone who was open minded or curious, not just close minded about trying something theyve never tried before and see what results they got compared to mine and what they usually get..

    lol, so i obviously know your not going to, i know what you think about it, so theres no more point in going on and on about it. a simple disagreement woulda been sufficient if even needed in the beginning
  • ruking1ruking1 Member Posts: 19,826
    ..."i just happen to ask about it when i was buyin my new air filter, i noticed a difference, decided to ask if someone else would try it see what they think.."

    ..."I surely hope you're kidding as there's no way you'd notice a difference with a new air filter unless it was REALLY clogged, and even then most likely only at wide open throttle. "...

    Actually, this might not play too well on Honda threads for a lot of Honda owners have spent some serious money on so called cold air intakes. To cut to the chase, for my .02 cents an almost total waste of money time and resources. Not a real concern to me if it is a bling bling kind of thing as the oem designs are functional and usually butt ugly. But in terms of filtering ability, not many filters come even close to matching the OEM filtering ability.

    The real issue is almost any car needs to pass a snow prophylactic test. Some oem designs CAN restrict air flow. The easiest and cheapest is to remove the snow prophylactic portion, (if you are comfortable without it, and knowing in the worst case it can hydro lock your engine) and still run the oem filter.
  • themistoclesthemistocles Member Posts: 95
    im not talking about a cold air intake... i bought just a K&N air filter for my stock air intake...........
  • ruking1ruking1 Member Posts: 19,826
    Two potentially big issues with the K&N. 1. If you have a MAF, the (exposed) chip portion is potentially subject to mineral oil coating damage. 2. Again the K&N cotton gauze oiled filter does NOT filter as well as the oem filter.
  • patpat Member Posts: 10,421
    We're getting pretty far away from reporting real world miles per gallon for Civics...
  • ruking1ruking1 Member Posts: 19,826
    Yes we are, but the nexus is the so called cold air intake and K&N filters will NOT add (statisically) significant REAL WORLD mpg! They will expose (the down stream)components to increased particulate materials unfiltered by the so called "looser" oil cotton media. This can be checked by before and after UOA's and show up as increased silicon (SI)
  • themistoclesthemistocles Member Posts: 95
    yea i dont think either will give you better gas mileage. still waitin to report what gas mileage ive been getting now. I actually disagree about k&n's not filtering as much as regular filters. ive used them in all my cars, never had any problems. my unlces a mechanic, uses em in all his motorcycles and cars(5 bikes, 4 cars). Never had any problems with them. Know plenty of others who strictly use them. Some people dont like em and dont trust em, all well..

    Anyway, I was curious what mileage people have gotten in the new civic hybrids? how much better is it actually than the regular civics? I have a friend who is looking at getting either regular civic or the hybrid.
  • ruking1ruking1 Member Posts: 19,826
    The UOA's are really the ultimate arbitrator. You could actually run a system sans an air filter, and never have many problems.

    Since I needed a commute vehicle back in 2004, the 7,000 premium of the hybrid was a BIG factor. Even at a hybrid's 48 mpg vs Civic gassers 38-42 mpg, 7,000 dollars buys a HUGE amount of commute fuel!

    So at 3.11 per gal (chose your local prices obviously) 7,000 buys 2,250 gals x 38-43 mpg, the mileage range is 85,500-96,750 miles. That is 6-6.75 years of my commute mileage.

    I will leave it to those that care, what the break even point will be between a hybrids 48 mpg and a gassers range of 38-43 mpg is.
  • patpat Member Posts: 10,421
    I know what the nexus was. But it's time to get back on track. ;)

    Themistocles has been talking about Si Upgrades and Performance Mods and maybe some of this conversation might move to that discussion.
  • ruking1ruking1 Member Posts: 19,826
    ..."I know what the nexus was. But it's time to get back on track. ;) "....

    For me, the issue now focuses on the mpg for the second 50,000 mile(s) leg! My swag: it will be pretty similar. :)

    As an off topic comparison diesel, (VW Jetta TDI) the second 50,000 miles (fuel mileage) seemed slightly better than the first, sans the so called "break in" and subsequent "break in" oil changes" and much longer OCI intervals. I am looking forward to the third 50,000 miles.
  • disk64disk64 Member Posts: 1
    I bought a 1994 Honda Civic Sedan EX because my round trip commute to work is 110 miles and my Dodge Durango was costing me a small fortune in fuel each month.

    I put the cruise control on about 62, and then drive straight to work on a major interstate with no lights. For my first 3 tanks, my mileage has been:

    38 mpg
    46.6 mpg
    42.7 mpg

    I fill the tank until the gas dispenser stops, and then reset the odomenter, and then calculate the mileage at the next fill up. Funny thing though, I thought the tank on this model was 11.9, but when the needle is in the red zone of E, I fill up and only ever get 8.5 gallons into the tank.

    Very happy with new used Civic, and the great gas mileage.

    Dave
  • bwilliam13bwilliam13 Member Posts: 5
    Just took a trip from Lincoln, NE to Florence, CO. Mostly level driving for about 350 miles, about a 15 mph headwind most of the way.

    From Lincoln, NE to North Platte, NE, it was 225.6 miles. I filled up again in North Platte, where I put in 6.554 gallons of Premium (91) at $3.34 / gallon. That's 34.42 mpg.

    I then filled up again a little south of Denver, CO...between Denver and Castle Rock. From North Platte to that gas station was 260.8 miles. I put 7.887 gallons. That's 33.06 mpg.

    Speed limit was 75 mph. I had the cruise set at 79 mph. RPMs were right at 3.4k at that speed. I'm sure if I backed down to 71 or so, I could add another mpg or so. But, I think that's pretty good in that car.

    Once I got past Denver/Colorado Springs and got into the mountains, I stopped keeping track.

    Mileage on the car when I left Lincoln was about 2300. Still on my 2nd oil change. Going to change it when I reach 3750 and switch to Mobil 1 synthetic.
  • civic2086civic2086 Member Posts: 6
    With mostly highway driving between 50 to 62 mph, I consistently get between 38 to 41 mpg. Usually 38 to 39 though. I did however just spend a little over $1,000 on suspension repairs (struts, engine mounts, etc.). That was a major "ouchie!"
  • crusher1crusher1 Member Posts: 9
    Filled up tank to neck of filler tube before trip, so its an exact fuel HWY consumption
    I used up 13.615 liters for 204.1 kilometer = 126.821 mile The fuel consumption works out to
    6.67 liters/100 km = 42.350965 miles/gallon(UK)
    6.67 liters/100 km = 35.2645552 miles/gallon(US)
    What is everyone else getting?
  • shiposhipo Member Posts: 9,148
    Be advised, filling your tank up to the filler neck is a very fast way of destroying some of the emissions equipment on your car, especially the evap cannister. A far safer way of figuring our your mileage is to buy a ScanGauge and mount it in your center stack.

    http://www.scangauge.com/

    Best Regards,
    Shipo
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