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-Brian
Ken
Admittedly, though, I will probably go with a dedicated winter tire on the next vehicle I purchase, just to see how they do.
My guess is that the manner of storage is probably more important for unmounted tires, as they are more subject to weight loads deflecting the tire. In that case, I would say that stored on their tread, with no weight on top of them (in other words, refrain from using them as a shelf!), is probably best unless you can store them on their sides without stacking anything (including other tires) on top. I would go with the custom shelving option and just roll them underneath the bottom shelf or have a "skinny" shelf for each tire if lying them on their sides.
thank you!
- Tire pressure
- Ambient temperature
- Oil viscosity
- Air filter
- Gas quality
- Driver style
- Driving type
Any of these change in the last few months? My guess is that the engine management unit learned your more agressive style and is sacrificing fuel efficiency for your heavy foot. One little experiement you can try is to reset the ECU by removing the negative battery terminal for 30 minutes. You'll see an initial drop in gas milage then a gradual increase as the unit leans out the mixture. Or, you can simply drive more gently and it'll learn that way too.
Ken
Ken in (cool but dry and sunny) Seattle
In tests by the German Auto Club ADAC and the Norwegian magazine Motor, the Nokian RSI ranked tops and the Michelin X-Ice was a close second of the tires available here. We have both and they are both good. We also have Nokian WR's on our Mazda MPV - an All Season tire with the Severe Duty Snowflake rating.
I'd rather have a FWD with dedicated snows than a Subaru with A/S - that's how much of a difference they make.
Tires should be properly inflated and heading the same direction. If there was a mishap with a curb or similar, it could knock the alignment off and affect tire wear and fuel mileage. You want the tires going like this || not like this /\ or \/.
The custom shelving system was simply a bunch of scrap 2x4's for a frame and some 1x6 stock for the shelves. Each shelf holds one time to keep the alloys from getting scratched and I line the shelves with cardboard.
city 21.5 mpg But when the cold weather hits around late november it drops to 17 mpg city.Done it two winters now.
Very high speed trips at just under 80 mph yield about 24.4 mpg which I consider excellent.
~Colin
What is meaningful is 100% highway driving, that is to say one (or more) tankfuls of steady highway miles, with complete warmup, and without the effects of persistant winds (either head or tail) and hills (either up or down).
If you pull off the interstate, fill up the tank, reset the computer, drive 300-400 miles and then fill up the tank, you should get a fair representation of the vehicle's economy with that type of fuel, AS YOU DRIVE IT.
As for our 05 VDC (20,000 miles), almost all the miles are highway miles, a majority of them on long-haul trips. The best we have done is 27.9 on the computer, but I think manual calculation yields a slightly higher number. My guess is that at 60 mph on a flat interstate highway the VDC will get 30 mpg
There are a few things that I think will help you get the best mileage:
1. use premium fuel. I believe that mileage is better with incresed octane, so that the money you lose in $/gallon is recaptured by increased miles/gallon.
2. Keep the tires inflated as high as possible.
3. Lose anything on the outside of the car that will cause drag. Specifically, any rack or box on top is subjected to magnified wind drag. I have even removed the factory cross-bars. An added advantege is that the car handles better at high speed. There is something about the way the transmission is geared that makes aerodynamic drag especially important. This was not the case with our 98 OB, which seemed to be unaffected by all sorts of cartop appendages.
4. Observe the instantaneous MPG numbers on the computer as you drive to notice how your driving style affects efficiency. If you care about efficiency, learn to drive conservatively.
Just my 2 pennies worth.
DB
That's odd - I own an H6; I've logged every gallon of fuel used since new; alternated between high test and regular every few thousand miles (because you can't reset the new ECU like the old one). There's no difference. What do your fuel/mpg logs show?
2. Keep the tires inflated as high as possible.
Underinflated tires decrease your mileage. Overinflated tires do not increase your fuel mileage. Most new tires can be run at 35-40 psi cold with no trouble.
Suffice it to say that the car will run on 87 octane but it has less power and a mighty hesitation when it downshifts. It likes 89 better and 91 even more. If you alternate between 87 and 91 then your tank is probably filled with 89, which I would call middle-grade. I don't think it is advisable to go any lower than that.
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One downside to running tires at 40 psi is that the ride will be harsh. We have these old concrete highways out here in Washington that have been worn down to cobblestones and even in the best of cars the noise and vibration is numbing.
Why would/does that happen? I have an 06 3.0 and I have started to use premium exclusively because I have noted that from a stop I have a hesitation if I get on the throttle too hard if I do not use premium. If I use 91 octane or above I have no issues.
I don't understand why lower octane would cause a hesitation from a stop.
Any insight?
Karl
My previous Outback was an 02 LLB with the last generation H6. One time my wife filled the car with regular gas, and I noticed right away (enough of a difference to ask her what gas she put in, and then it all made sense). So I definitely appreciated the recommendation for premium in that vehicle. Subaru quoted a measly 4HP drop in peak power without premium fuel, but the overall feel of the engine was more of an issue to me than the 4HP. Like many engines designed for premium, the H6 is just not as smooth with lesser octane. I think what it really means is that they are on the ragged edge of performance/tuning with the premium fuel.
Thanks for the education.
Karl
On a side note, more than one Subaru has been known to have a bad knock sensor, and will knock all the time. Usually replacing the sensor (an accelerometer bolted to the engine block) solves the problem.
Suffice it to say that the car will run on 87 octane but it has less power and a mighty hesitation when it downshifts. It likes 89 better and 91 even more. If you alternate between 87 and 91 then your tank is probably filled with 89, which I would call middle-grade. I don't think it is advisable to go any lower than that.
I do keep a log - no difference.
More power? I also put my 3.0 on a chassis dyno - running Regular. No evidence of detonation, nor was the spark retarded - I checked the logs (which took as long as the run).
Here's what SOA says:
########
Thank you for taking the time to contact us. We hope that you have been enjoying your 2006 Outback 3.0R Wagon.
The 3.0-liter H6 engine is designed to operate using unleaded gasoline with an octane rating of 91 AKI or higher. Regular unleaded gasoline with an octane rating of 87 AKI or higher may be used. This is not just for emergency situations. You can use regular unleaded fuel in your vehicle on a regular basis. However, for optimum engine performance and driveability, it is recommended that you use 91 AKI or higher grade unleaded gasoline.
You may experience reduced output, poor accelerator response, and reduced fuel economy when using gasoline with an octane rating lower than 91 AKI, depending on your driving habits and conditions.
If you experience any of those conditions while using a lower octane rated fuel, you may want to return to using 91 AKI octane rated fuel as soon as possible. Additionally, if your vehicle knocks heavily or persistently, or if you are driving with heavy loads such as when towing a trailer, the use of 91 AKI or higher grade unleaded gasoline is required.
Thank you for the opportunity to be of assistance. If you need any future assistance, please feel free to contact us again.
Best wishes,
John J. Mergen
Subaru of America, Inc.
Customer/Dealer Services Department
#######
All that said, some of the alcohol-blend Regulars seem to have very low Octane. We are getting pinging with some brands even in our trucks. So try changing brands if you experience knocking.
I'm in Canada & we pay a real premium for 91 octane: its over 10% more than 87 octane, so with the price of gas being what it is, I've settled on 89 (its only 6% more). With 87 I notice pinging under acceleration on an incline which disappears with 89.
I ran 91 on a trip this summer though Nevada & Arizona & was getting 25 - 27 mpg running at 80 mph. I'm sure it would be better if I was driving 65 mph, but I don't seem to have the patience for a full tank.
Ethanol gas is available all year round at some stations & you can buy 90 octane for the same price as 87. At first I thought it was a deal, but found that the price advantage was offset by lower milage (I keep logs). City milage (and I mean real city driving, lots of traffic & lights on my morning 9 mile commute) has always been terrible - it was in the 11-12 mpg range when new & is now in the 13mpg range. The poor gas milage has always been my main beef with the subie!
I'll have to try the 91 again (no ethanol) and see if the hesitation goes away.
Any idea what the code means, and are they documented somewhere in the manual that I missed?
Thanks.
I had a very standard drive (30 miles one-way with little or no traffic), and standard summer weather (hot and humid). So I decided to see if premium was worth it. I started with premium fuel, ran three tanks of it noting the mileage. Then I moved to mid-grade, running a couple of tanks to "flush" out the premium. Three tanks of of mid-grade and mileage noted (each tank of any grade yielded about 350-400 miles). Same thing for regular - then back for another premium round (to compensate for any break-in changes). Bottom line: the mileage with premium was sufficiently greater (a bit over 10% compared to regular - with mid-grade in the middle) to just about make up the difference in price ($1.05, $1.15, and $1.25 at the time). And the performance with premium was noticeably better - purely a subjective assessment. That mileage difference would be even more significant at today's gas prices, which still seem to be about $0.10 per grade different depending on where you are).
This was the only place I've ever lived that I could do what I considered to be a fairly reliable comparison. So take it FWIW. Hope this helps a bit.
Ken in (amazingly, still sunny) Seattle
Got home, turned off the car, turned it on again, and bingo....all back to normal. In hindsight, I should have pulled over immediately and tried turning the car off.
This was about two months ago....hasn't happened since. Of course, the dealer had no explanation
Cheers.
I wonder if there is a loose common ground....which has been known in Subarus.
As good of a guess as I have heard so far.
HC = HicCup?
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I got the same warning a couple of times before everything went dead for good. Dealer replaced the head unit.I drove the car for four days with a big hole in the center consol.Also with ac on max. If some day they replace yours dont forget to take the cd's out of your radio.Because the head unit is the radio and the climate control. Happy Motoring.
Thanks for any additional help.
I had a very standard drive (30 miles one-way with little or no traffic), and standard summer weather (hot and humid). So I decided to see if premium was worth it. I started with premium fuel, ran three tanks of it noting the mileage. Then I moved to mid-grade, running a couple of tanks to "flush" out the premium. Three tanks of of mid-grade and mileage noted (each tank of any grade yielded about 350-400 miles). Same thing for regular - then back for another premium round (to compensate for any break-in changes). Bottom line: the mileage with premium was sufficiently greater (a bit over 10% compared to regular - with mid-grade in the middle) to just about make up the difference in price ($1.05, $1.15, and $1.25 at the time). And the performance with premium was noticeably better - purely a subjective assessment. That mileage difference would be even more significant at today's gas prices, which still seem to be about $0.10 per grade different depending on where you are).
This was the only place I've ever lived that I could do what I considered to be a fairly reliable comparison. So take it FWIW. Hope this helps a bit.
If you conduct this experiment with your Subaru, it won't be accurate. That's because you cannot reset the ECU on the newer Subarus like you can on older ones. I notice you don't give a range or actual mpg - why not? When it comes to fuel economy, the #1 variable is the driver's right foot. Not even oil companies claim better mileage with high test.
Based on your hypothesis, which tanks are Regular and which high test in this log of an actual Subaru H6?
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Since I am (obviously) not an automotive engineer (just a simple medical researcher), I am not familiar with the inner workings of ECUs - I had been under the impression that they adjusted spark timing to compensate for octane changes. There were no operator-available ECU adjustments involved in my trials.
I understand that the primary reason for building engines that use premium fuel is increased power production from the same displacement engine, but I am unaware of any oil industry studies on octane/mileage so I can't comment. This experiment may not be reproducible in Subarus, but I didn't make that claim. The essence of science (when it comes to data) is knowing what to pay attention to and what to ignore.
I can't address the question about your mileage from "mixed" driving because there are likely too many variables that I am unaware of that affected the outcome. I only take responsibility for (and attempt to interpret) studies that I have conducted or overseen. The point of my post was that this was (for me) a once-in-a-lifetime opportunity to conduct a test that might yield useful information. Obviously, I could never repeat this trial in Seattle.
Ken in (now rainy) Seattle
Also, is the California version of the 2.5i a PZEV? (Partial zero emission vehicle.)
-juice
Not sure which one's better, Partial Zero or Super Ultra Low (these names are kinda silly!), or if the same engine can have both ratings. Maybe the 2.5i gets the better rating, and the turbo gets the next one down? :confuse: Prob'ly not much help. FWIW, I've also read the Cal-spec cars develop peak torque at slightly lower RPMs.
Horsepower did jump a little starting in '06 with the introduction of AVCS (active variable valve control system). I think it's a noticeable improvement. AVCS also increased the city MPG slightly. I have an '06 Legacy sedan (2.5i SE w/AT) and think the acceleration is pretty sprightly. Guess it all depends on what you're used to, though. No complaints about the power, but the 5-spd AT would be welcome. Incidentally, our real-world fuel economy has been better than I anticipated. All Subaru turbo models require premium fuel, so the 2.5i would also save you a little at the pump.
Subaru did a few safety improvements starting with the '06, allowing it to ace the side impact tests and boost it to the best possible rating for front, side and rear impacts. Only car in its class to ace all three. Better than Volvo, even.
The top safety rating, better-feeling power and slightly better fuel economy starting in '06... I think it's worth going for an '06 or '07 rather than '05. Other '06 improvements in the Outback include standard air filtration, standard engine immobilizer key (which should lower your insurance!) and standard 17" alloy wheels. Sorry to be so long-winded. Whew!
'07 Outback: http://www.cars101.com/subaru/outback/outback2007.html#prices
'06 Outback: http://www.cars101.com/subaru/outback/outback2006.html#prices
This CA gov't site confirms non-turbo Outback & Legacy as PZEV:
http://www.driveclean.ca.gov/en/gv/vsearch/cleansearch_result.asp?vehicletypeid=- 16
And this Subaru press release has a good section of info on their PZEV vehicles, if you scroll down, as well as some impressive Subaru environmental info right below that:
http://www.subdriven.com/news/publish/Subaru_News/article_449.shtml
How so? Do you mean pulling the battery terminal won't reset the ECU?
Ken