Infiniti G35 Real World MPG

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  • g35xfung35xfun Member Posts: 7
    I recently purchased a G35x. Knowing that the tank is 20 gallons, I was surprised at my first fill up when the "fuel low" indicator came on, and when I got the gas station with still 25 miles left on the estimated range, I only had to put in 16.5 gallons. Is this normal? Is the tank actually much smaller than the 20 gallon? In the manual in back it lists the fuel tank size as 20(US) and 16(IMP). What does that mean? It seems I was able to get 321 miles on 16.5 gallons which higher than the 18.5 mpg average the computer shown, is there something I'm missing? Thanks.
  • cdnpinheadcdnpinhead Member Posts: 5,608
    that most manufacturers these days go to great pains to keep anyone from running out of fuel, or even running the fuel really low. Part of this could be due to the fact that fuel pumps immersed in the tank are the rule these days and they depend on the fuel for cooling. Overheating the fuel pump is a bad thing.

    Just my opinion, but I've noticed exactly what you have on several of the cars I've driven/owned over the past several years.
    '08 Acura TSX, '17 Subaru Forester
  • scottm123scottm123 Member Posts: 1,501
    Part of this could be due to the fact that fuel pumps immersed in the tank are the rule these days and they depend on the fuel for cooling. Overheating the fuel pump is a bad thing.

    This is correct.
    I've posted this info in the past but my search results didn't find the post.
    You actually have about 5 gallons in the tank when the miles remaining reads 0.
    This does NOT mean that you can keep driving though, as you'll end up burning out your fuel pump prematurely.
  • mickeyveemickeyvee Member Posts: 12
    No Kidding! You'll burn out the pump??? I have a 2006 G35. So as soon as the orange light goes on, I should fill the tank?
  • scottm123scottm123 Member Posts: 1,501
    No need to panic. It would take a lot to burn a pump out.
    The pint is that the pump needs to be submerged in order for it to be properly cooled and lubricated.
    Running the tank until it's completely empty could cause the pump to have premature wear.
    (I've read this in a few other tech forums and posted this info here as well)

    Just drive the car as you would any other car.
    When it reads 0 miles remaining, fill her up.
    When she's full, put the hammer down.

    Just don't calculate what you've put in and then run it way past the 0 miles remaining mark.
    Yes, there's more fuel in there, but it's not yours... it's the pump's! :P
  • cdnpinheadcdnpinhead Member Posts: 5,608
    as an emergency reserve -- something you might need to dip into (literally) once every year or two, which certainly isn't going to affect the pump, I would think.

    Routinely running to the full tank capacity could.
    '08 Acura TSX, '17 Subaru Forester
  • mmasongommasongo Member Posts: 1
    I have an 07 G35S 6MT and am getting 16.4 mpg around town. I have only 1400 miles on the car.
  • gsportgsport Member Posts: 4
    and i have g coupe sport package chicago il 14-16 mpg those are the real miles when you have fun in that car
  • jason31480jason31480 Member Posts: 9
    06 G35x, 10k miles, 75%/25%(Hwy/City) drving. I usually keep it around 75-80 mph on the highway. So far, I am getting about 22-23 mpg.
  • fpajerskifpajerski Member Posts: 4
    07 G35 Journey bought 28Oct2006, first in the Sacramento area. Now have 17K miles on it. Noticed mpg (and engine responsiveness) steadily improving during first 10K miles, but no details for you. Premium gas always used. What I do have details on are for two recent extensive road trips:

    1) 25.6 mpg overall for 10K miles during six weeks in April and May between Sacramento and Charleston, swinging south thru mid-Mississippi and north thru northern North Dakota, driving up to 80 on interstates, 65 on US highways, 55 on state highways, and 45 on county roads, and a lot of slow stop-and-go when in national/state parks and small towns or when lost on scenic dirt/gravel backroads.

    2) 26.9 mpg overall for 3300 miles during three weeks in June and July on a loop thru Idaho, Montana, and Wyoming. Same driving conditions as prior trip ... a combination of everything everywhere.

    These mpg values are better that I would have expected, when thinking about all the low gear slow speeds climbing very steep twisty mountain roads or all the time between zero and twenty when in parks like Yellowstone during the summer and RV's are blocking the roads worse than the buffalo.
  • sweendogysweendogy Member Posts: 1,310
    2k miles on the g and still getting 17 mpg --seems to be a level way lower then expect. I have been not driven the car hard yet and do mostly city driving (prob the problem) but again easy on the gas. I use nothing but premium.. o yeah found out yest that if the car is locked the gas door will not open-- i had to call the dealer to figure this out.. nice car just wish the mpg would grow into MPGS....
  • sweendogysweendogy Member Posts: 1,310
    put 500 miles on the G over the weekend-- got over 20 mpg-- 95% highway miles -- the actual figure was 20.4 mpg which for me is a huge win..
  • keithlkeithl Member Posts: 106
    I really liek the car, I have driven sport sedans for 7 years now, I30, I35,04 TL, 06 TL and 07 TL. While I don't have an issue with Premium, I do think from my reading th eG35 has an abnormal consumption of fuel. Reading forums even modest driving seems to yield 18-19MPG on average. It seems most other cars in this class are able to get 21-22 on average. Sure it doesn;t sound liek much but you add the few hundred a year for premium on top of the few hundred a year for the low MPG and it adds up. Sure people argue if you can afford the car you can afford the gas. I disagree. I want a nice car with acceptable perforamcne and not to be wasting huge amounts of GAS. Is 306 HP fun, sure, do 98% of the owners need it or use it, probably not. My TL has decent performance and gets 22.5 on Average. Based on my 17K a year that is over $600 a year differcnce due to MPG, that is mor thana car payment.
  • scottm123scottm123 Member Posts: 1,501
    I get 22.x with mixed City/Highway driving and I'm at 27.x on pure Highway.
    I don't do any pure City driving, so I don't suffer the lower mpg numbers.

    I do get 18.x with "spirited" driving in my City/Highway mix but this is a performance vehicle and I knew what I was getting into when I bought it.
    Honestly, the G's fuel economy is better than I expected it to be, and I'm quite happy with it.

    It sounds like you've weighed what is most important to you and that's what's important.
    If I wanted acceptable performance and had MPG at the top of my priority list, the TL would most likely had won.

    I wanted AWD, and a car that could hang with the rest.
    The G offered just that.

    Good luck with your decision, but know that the G's mileage is better than the few people here who complain about it.
    I'm very happy with my 07 G35x offering 22/27.
  • sweendogysweendogy Member Posts: 1,310
    I;m glad your getting great mileage on your car but I do think people should voice the actual MPG numbers they are getting to inform others on what to look for. I have had the G for 3 mths and have just over 2500 miles on it-- 20 mpg once achieved (last fill up)on 90-95% highway driving and hoping for further increases as the engine is broken in. The fact is $3 plus a gallon is now a huge interest of those driving and gov't MPG estimates have real meaning. scottm123 --how many miles are on your car, when did you start seeing a real change in mpg's? 22/27 sounds terrific.
  • scottm123scottm123 Member Posts: 1,501
    I have 5,200 and change on the car right now
    Just as it was predicted by 07 G owners, I started seeing a change for the better at 3,500 miles.

    I'm getting 18/22/27

    That being:
    Spirited City-Highway/City-Highway/Highway
  • kb124kb124 Member Posts: 60
    I don't see much mention in these MPG posts regarding whether the A/C was on or not. I assume this would affect MPG?
  • scottm123scottm123 Member Posts: 1,501
    I brought my G home on 4/07 and the A/C has been on ever since.
    There's no real advantage to turning off the A/C and rolling down the windows, so I opt for comfort and keep the A/C on most of the time.
  • sweendogysweendogy Member Posts: 1,310
    In all city driving the last tank lasted just over 250 miles for a return of 17mpg again.. o billy not the best but most of the driving was back and forth to work 5 miles in city traffic. car just hit 3k miles
  • scottm123scottm123 Member Posts: 1,501
    17, in that kind of driving, is actually not too bad.
  • gohmdoongeegohmdoongee Member Posts: 11
    Hi guys, I just picked up my G35x last week. Have roughly 200 miles on it. I've been averaging only 14-16mpg. Is this normal?

    I'm hoping that its because its still in the break in period. and that it'll go up once it passes a couple of miles. can anybody confirm this? thanks
  • scottm123scottm123 Member Posts: 1,501
    Sounds like you're doing more city/backroad driving than highway, with 14-16 mpg.
    On the highway, you should be seeing somewhere between 18-20.

    I also have an 07 G35x.
    Once my car hit around 3200 miles, the mileage jumped quite a bit.
    I do not do any "city" driving.
    My commute is a 45 mph stop and go commute for the first 20 miles, and highway for the next 25 miles, with the highway seeing a good amount of traffic.
    So, it's hard for me to fall into either City or Highway categories.
    With this crazy commute of mine, I'm getting 18.x MPG.
    This is in "M" mode, with some spirited driving techniques. ;)

    If I put the car in "D" mode, I'm getting 22.x off the highway, and 27.x on the highway.
    This is a major jump in mpg from before the car was broken in.

    I'm also using 93 octane fuel, which helps as well.
  • gohmdoongeegohmdoongee Member Posts: 11
    Thanks for the info.
    I don't commute t work. Its mostly for pleasure, and I do a quite a bit of highway driving (around 75-85). I would say my last (first) tank of gas i drove 70% highway.
    Hopefully I will be getting much better milage once the car breakes in... Its just that it worries me a bit with the current MPG.
    When was it exactly that you started to notice better milage? after 3000 miles?
  • gkinzellgkinzell Member Posts: 1
    Just did a 2700 km trip thru Oregon/Washington states, kept the speed at or near the posted limits, 90% hiway and averaged 27mpg using mid-grade gas. City mpg???? dont kno, never drive the car in town, thats what they make motor-sickles for..

    B well..
  • scottm123scottm123 Member Posts: 1,501
    When was it exactly that you started to notice better milage? after 3000 miles?

    Once my car hit around 3200 miles, the mileage jumped quite a bit.
  • kandbert1kandbert1 Member Posts: 9
    I was getting about 17 mpg until 3500 miles and then the mpg went to about 20. At 5000 miles the mpg dropped signicantly to about 15.6.
  • scottm123scottm123 Member Posts: 1,501
    I'm in the mid 6K range and I've seen absolutely no drop in efficiency (thankfully!)

    Did you start using a new fuel, or the dreaded "M" mode? :P
  • turborodturborod Member Posts: 4
    I don't know why some of you folks are getting poor gas mileage on these cars like 14-15 MPG unless you have your foot in it most of the time. I have about 6000 miles on my 07 G35 Sport with about half city driving and the other half highway driving. For the entire 6000 miles I am averaging 22.5 miles per gallon on premium gas which I think is pretty good. If one is really concerned about mileage you shouldn't be driving this car. I checked one highway trip 300 miles from Phila to Boston and averaged over 26 miles per gallon. Maybe some of these cars come from the factory better tuned than others?
  • scottm123scottm123 Member Posts: 1,501
    I agree... your numbers are very close to mine.
    And that's with the fact that I DO have my foot in it once in a while!
    I knew what I was buying into when I got this car, thanks to my 1 yr+ of research.
    I've been pleasantly surprised with my mileage. :)
  • tcdenver1tcdenver1 Member Posts: 1
    I have followed this discussion for a while because of MPG issues with my 2006 G35X. I got only 16-19 since day one. Disappointed, I have been asking and doing research on how to get better MPG. When complaining to an Infinite rep on the phone one day, he asked what gasoline did I use. I had always use premium only for G35 and Maxima. Then he brought up what was mentioned in the Manual - 87 or higher, and how Infinite could not be responsible for lower MPG if premium was used. I did not take his words seriously.

    After long enough, I decided to give it a try. About 6 weeks ago, I started to use mid-grade. Guess what, I saw immediate, significant improvement in MPG by about 3 MPG. After 3 fill-ups, I went back to premium, and surely MPG dropped right away. Now I will only buy mid grade for my G35X. I am getting 19-20 for city and 22-24 for highway.

    I don't know if anyone has similar experience. But I am happy with the outcome. The car is still king of highway without noticeable drop in hp (at least from what I can feel).
  • gohmdoongeegohmdoongee Member Posts: 11
    Hey guys,

    I'm still on my way to my first 1000k mark. But it seems like milages are getting worse and worse! this time, i did mostly city driving... but still! how can i get 10mpg?!

    i've noticed that a lot of these gas stations are starting to use 10% ethanol. do you think this might have anything to do with it?

    And anybody know if there are any adverse effects of ethanol? thanks!
  • scottm123scottm123 Member Posts: 1,501
    My gas station also has 10% ethanol stickers on thier pumps.
    It hasn't ruined my numbers.
  • jessi0509jessi0509 Member Posts: 4
    I got my 6-Spd G35 Coupe 2 months back ... July 27th .. Since I got the car, have always been driving with the A/C on ... abt 75% Hwy/25% city - I usually drive on the Hwy at 75-80 ... sometimes even exceeding that for small bits ...

    The first ever fill up gave me 13mpg, the next 15mpg .. and then 18 .. 20 .. and 22mpg ...

    I now have about 2800 miles on the G ... and the mileage has kinda steadied at abt 21/22 mpg ...

    So am pretty happy with it ... !
  • jennmajennma Member Posts: 40
    With just about 1150 miles on my 2007 G35 Sedan 6MT, the first couple of tanks of petrol had me at about 20.5 MPG, with about 60% highway and 40% stop and go. The current tank is running at more like 23.5 mpg with about 75% highway driving. This is all using premium fuel.

    Since the car is still very new, I've been trying to stay about 70mph on the highway the majority of the time. It is easy to sneak up past that though. :shades:
  • ryhk83ryhk83 Member Posts: 1
    I recently got the g35x and now i only have droven for 500 miles...but my mpg is around 10-11 doing most of city driving
    so..i just wonder if other ppl got the same experience or if it is just my car which gets really bad mpg..
    thanks in advance guys~!!
  • gohmdoongeegohmdoongee Member Posts: 11
    Wow So what people are saying really is TRUE!
    I have roughly 1k on mine right now, and i'm still getting AT MOST 18mpg.
    I can't wait till it goes to 3k and see the jump!
  • shov8shov8 Member Posts: 87
    So far I've got a whopping 320 miles or so on my new G35. Almost time for my first fill up :) Anyways, I am averaging just under 19 mpg so far. I probably drove 70/30 hwy/city since I've had the car (a few trips to work and one to get my clear bra re-done). I have the center dash LCD displaying the instantanous MPG - for some reason I am fascinated by it :)

    Overall I'd say I'm am pleased with the MPG so far.

    kc
  • sweendogysweendogy Member Posts: 1,310
    I have 3500 miles on my car and my last fill up i avg just over 16 mpg --most of my driving has been city doing 3 mile trips to work and back but on avg i'm having to go just 250 miles between fillups. Not really happy with the 35x mpgs.. I think the transmission is to blame for this 5 speeds not enough for the amt of power coming from the engine.. I would like to see better gearing or a city mode button in cars that would adapt (like the sports mode) to such driving.
  • shov8shov8 Member Posts: 87
    Three miles to work... that's like a dream come true :) I'm about 32 miles one way from work, but luckily I do get to work at home several days a week.

    kc
  • sweendogysweendogy Member Posts: 1,310
    yeah 6 miles round trip not to bad-- just filled up a half tank today and 9.65 gallons of gas 132 miles =13.67 mps this time around --o billy --
  • scottm123scottm123 Member Posts: 1,501
    On the other side of my garage sits the 06 Acura MDX.
    This was handed over to the wife when I picked up my G.

    When I drive the MDX, I get 23.x on the highway.
    When the wife drives it, she gets 18.x

    There are no changing variables.
    It can be on the same road, on the same day, with the same weather and temp in the same conditions, same altitude, tire pressure... everything the same.

    The difference is in how she drives.
    She has this habit of constantly adjusting the throttle.
    It's very slight and she doesn't even notice she's doing it until I point it out, but it's there and it causes fuel efficiency to take a drop of 5 mpg.

    When I bought the G, I knew the fuel economy was less than that of other sedans, but found it to be worth it for the performance I got in return.
    I hate listening to people complain about the G's fuel usage being less than acceptable.
    I can assure you that it has something to do with the way the car is being driven, maintained, or fed (fuel type) or everyone would be complaining, and not just a select few.

    Take it on more than a 3 minute drive through the city. Give it some good 93 octane gas, check the tire pressure, get it on the highway and set the cruise to 65.
    Reset the fuel economy and drive for 30 minutes without touching the gas pedal and then report on your findings.

    I get 18/23 with my spirited driving and 27 and change on the highway when the ICC is set.
    Not bad for a sports sedan, being driven like a sports sedan.
  • scottm123scottm123 Member Posts: 1,501
    I spelt blaim blame wrong... :blush:
  • sweendogysweendogy Member Posts: 1,310
    BLAME --interesting -- so my city findings dont matter here and i should not "complain" about the MPGs.. My car has 3500 miles and most of my driving is city -as I do not have the luxury of longer highway trips- i fill with 93 -- my tire pressure is correct--and I dont race from traffic light to traffic light-- not really complaining as much as reporting --wish i had your lucky right foot i'm sure you could get 20mpgs in a ford superduty towing a 35ft boat.. thanks for the tips and sorry you had to listen to my findings..
  • scottm123scottm123 Member Posts: 1,501
    Wow...

    Your findings do matter. If they didn't, I wouldn't have responded.
    Why does everything have to become a personal affront?

    All I'm saying is that I see more people posting the very most negative they can find and not the other way around.
    I'm very sorry for your commute... must be a real bear driving 4 city blocks. :P
    The money you save in your short trip more than makes up for what you'd spend per week on gas/wear/tear if your commute was the more typical 50 miles each way.
    It's a wash.

    What I was saying is that I would like to see people like yourself... with horrible gas mileage... get the car on the highway, set the cruise, and see what it comes out to.

    I'd just like to see how good it gets.
    Nothing but city driving, 10 miles a day round trip, that car needs a good run anyway.

    If it's still lousy, then get as mad as you want, I'd still blame the driver.
    Getting you mad was not the intent here.
    Just my friendly retort.
  • piredonpiredon Member Posts: 50
    I have about 800 miles on the car. Mostly driving back and forth to work, average speed overall on the car is 40 mph (according to the computer). So far I've averaged 21 mpg.

    Used to get 24 to 25 mpg in my Subaru Legacy GT under similar conditions, and that car has almost identical EPA ratings. I guess the main differences are that the Subaru weighed 300 pounds less, was broken in and had a manual transmission. We'll see how this car does in another few thousand miles, it should improve quite a bit, I would imagine.

    I think my main issue with the G35 with regards to fuel economy is the lack of a 6th overdrive gear. 3000rpm at 70 mph is a recipe for bad fuel economy, and there isn't a heck of a lot you can do about it. I'd gladly pay an extra $500 for a 6th gear that spun around 2300 rpm at 70 mph. Hello 15-20% improvement in highway fuel economy!
  • decisionzdecisionz Member Posts: 3
    I strongly agree with the need for overdrive!

    My mpg experience (2007 G35x) at the 10k mark: 19mpg overall -- best 25mpg on highway. And I drive hard--excessively hard frankly--regularly exceeding 4k rpm on acceleration. But I drive that way partly because it doesn't seem to matter much to mpg. If I drive as efficiently as possible I might average 20 to 21(at most) mpg overall. This is simply not a fuel efficient car. After driving this a few years I will get my Toyota Camry hybrid (and be perfectly happy). In the meantime I love this car.
  • scottm123scottm123 Member Posts: 1,501
    I agree that this is not a fuel efficient car and also agree that another gear would possibly help slightly, at least on highway stats.
    But I get 27 on the highway already, so the extra gear won't really help that much.
    It certainly wouldn't help in city driving, where the car suffers the most.
    It'll also wash away the "swell" affect that Infiniti was going for... and I think they succeeded in.
    The car seems to have this never ending supply of power, even while on the highway in 5th gear at 80 MPH.
    Of course, a lot of cars with this power will show the same affect when sitting at 3,200 RPMs!

    Also remember that the 6-speed S owners are not reporting stellar numbers either.
    The 6th gear wouldn't help that much, unless all gear ratios were redone.

    I also drive a little more on the aggressive side.
    Quite honestly, a nun would have a hard time keeping this car under 4,000 RPMs.
    It just wants to be driven that way.

    What we need is a little button, which switches the car into grandmother mode, kills 50% of the power, and doubles the fuel economy.
    Then we can flick it when we want and have the best of both worlds. ;)
  • jennmajennma Member Posts: 40
    With a 2007 6 speed G35S, my usual MPG for each full tank of premium fuel is 23.5 to 23.9.

    I just passed 3000 miles yesterday. My commute is 28 miles each way, all highway, but there are 2-3 places of slower traffic, depending on the day/weather/accidents/crazy people. In addition to my commute, I have about another 5-10 miles per day that is not highway.

    Friday afternoon traffic + roadworks hurts.

    Interestingly enough, on this tank, I'm having trouble maintaining 23MPG. The difference being where I bought the fuel, even though it's still premium (usually it's at Mobil, last Friday I went to Costco to fill up). Maybe it is just a coincidence though.

    RPMs tend to stay around 2500 at about 70-75 mph.
  • sweendogysweendogy Member Posts: 1,310
    It becomes personal when you comment that your 'sick and tired of hearing people complain." (friendly retort??)when I was just stating fact. My 4 block commute is terrific btw.. And In the upcoming months I will be putting some serious highway miles on the car and look forward to seeing more MPGs at highway speed. ...Car does need 6th gear or a city mode button of some sort to manage engine speed as other posters have suggested. Great car overall and I look forward to New England winters--also as another poster suggested is premium gas (or gas in general) all the same? maybe i need to find another station.
  • g35floodedg35flooded Member Posts: 44
    I just got my G35X in September and I only have about 700 miles on it... I'm only getting 13.4 MPG. I drive mostly city miles but do drive on the highway occasionaly.

    Is this because the car isn't "broken in" yet? I was thinking of bringing it to the dealership but I've read to wait until I reach 1500 miles?
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