Gas Mileage FAQ - Page 16
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This is a discussion on Gas Mileage FAQ within the Everyday Impreza Talk forums, part of the Community - Meet other Enthusiasts category; IDK. If you have an accessport, you could probably figure that out.. but either way it's probably negligible....

  1. #226
    UnBanned Sinister's Avatar
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    IDK. If you have an accessport, you could probably figure that out.. but either way it's probably negligible.
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  3. #227
    Administrator RayfieldsWRX's Avatar
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    I've always been led to believe that the amount of fuel burned at idle is tiny. I use coasting or engine braking on a situational basis. Also, sometimes I just want to hear the engine as I'm slowing down.
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  4. #228
    Registered User uriahnazario's Avatar
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    Quote Originally Posted by kd5gwf View Post
    Here is my recorded data for the first 55k on my 2011 wrx wagon. I drive it pretty hard and live at 7k altitude. I use the max octane which is 91.
    edit: fyi, this value is about 1-2 mpg less than the digital readout.
    Attachment 104367
    How are you logging your data?

  5. #229
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    My MPG meter never showed more than 19mpg even driving on the highway at constant speed for 4 hours.
    Only 1,500 on the car.
    I will calculate it myself to see if the mpg meter is accurate.
    But that is awfully low mpg.

  6. #230
    Registered User Ingo's Avatar
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    ^ it is very low. I have a modded suby, it has larger injectors, therefore it shows way higher mpg's that is real (33 +/- in city). In reality I get around 20 mpg city, 28+ highway...
    You can't have everything - where would you put it?

  7. #231
    Registered User Ervz's Avatar
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    Quote Originally Posted by rexload View Post
    My MPG meter never showed more than 19mpg even driving on the highway at constant speed for 4 hours.
    Only 1,500 on the car.
    I will calculate it myself to see if the mpg meter is accurate.
    But that is awfully low mpg.
    If this is a new car then this is normal, at least is what I was told when I got mine way back in 06. Once the car is broken in and reaches at least 3K then you start seeing better mpg.

  8. #232
    Administrator RayfieldsWRX's Avatar
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    19mpg highway is normal, for a new WRX? Do you guys cruise at Mach 1?
    Seriously though, my hybrid build engine, when brand new, was ticking off 25mpg pretty regularly.

    I got 27.5mpg on the way back from CretinFest, last month.
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  9. #233
    Registered User Ingo's Avatar
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    Quote Originally Posted by Ervz View Post
    If this is a new car then this is normal, at least is what I was told when I got mine way back in 06. Once the car is broken in and reaches at least 3K then you start seeing better mpg.
    Really? Modern day engines and complete vehicles have very little break-in needs. 19mpg highway sounds plain wrong...
    I suggest the old method: fill up to full, go most of the tank and fill up again. Compare miles gone / amount needed to fill tank again to full...
    You can't have everything - where would you put it?

  10. #234
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    Quote Originally Posted by ElitestFX View Post
    I think this documentation took a very long time to produce and it seems to contains valid experience from real drivers. Thanks for taking the time to maintain it.

    I'd like to introduce myself. Call me Tommy. Other than knowing how to drive a car, I know nothing about cars. I figured this would be a good place to start learning.

    I just purchased a 2012 Subaru WRX STi about two weeks ago. It is an amazing ride. My route to work and home is about ~100 miles a day. It's probably a little more than 800 miles on the odo now.

    I've only been to the office 7 day these past two weeks, but I'm normally there 5 days a week. The images showed my current lifetime odo reading which is the same as the trip A reading and trip A's mpg reading.

    Those readings are based on my driving style when I brought it at 10 miles...

    98% Highway / 2% City - 8 out of 14 days
    65% City / 35% Highway - 6 out of 14 days

    Avg. % of Shifting less than 1.8k rpm - 2%
    Avg. % of Shifting around 2.3k rpm - 18%
    Avg. % of Shifting around 2.8k rpm - 20%
    Avg. % of Shifting around 3.2k rpm - 50%
    Avg. % of Shifting around 3.5k rpm - 6%
    Avg .% of Shifting around 4.0k rpm - 3%
    Avg .% of Shifting greater than 5.0k rpm - 1%

    97% Intelligent mode
    2% Sport Sharp / S# mode
    1% Sport / S mode

    Highway Cruising in 6th at around 2300rpm [50%] - 3100rpm [50%]
    I have the rev set at 3200rpm which keeps me under 80mph.
    I like to boost on the way to work. (5-10 second boosts, 2-3times a trip. 10 second+ boosts, 1-2 times a trip, 2-5 minute boosts, 1-2 times a trip)
    I stay off the boost on the way home with minor exceptions. I usually boost uphill when the lane is clear.
    I stay off the boost at least two miles before I reach my destination, and I leave the car idle for two or three minutes when I get to the destination.

    It probably did 80mph for ~3 hours during it's life so far.
    It probably did 90mph for ~15 minutes during it's life so far.
    It probably did 90mph+ for ~3 minutes during it's life so far.
    It probably did under 80mph for the rest during it's life so far.
    Welcome to the club and thanks for posting up your information
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  11. #235
    Registered User peekeesh's Avatar
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    Here's mpg on my12. mixed hway and city but it's mostly city;



    ignore first 2 fills as they are pretty inaccurate.

  12. #236
    Administrator RayfieldsWRX's Avatar
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    The number of new-gen guys that are getting dreadful mileage is a little discouraging.
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  13. #237
    Gold Member lokey's Avatar
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    My car tells me that I get 38 mpg.
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  14. #238
    Admiral Ackbar the 1st mycologist's Avatar
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    Quote Originally Posted by WRXpa View Post
    Nice data logging! I'm surprised you do as well as that at high altitude and with 91 octane

    I know, another rather old post - it got me to ruminating though.

    The octane effect at elevation is increased, so that might cancel out the effect. If timing was actually retarded it would have a negative effect.

    Otherwise the altitude will have less oxygen, which will meter less because the ECU senses absolute pressure, and thereby cause a reduction in fueling - basically reducing the amount of power and the efficiency. Boost levels will drop relative to sea level. Having less power on tap will reduce ability to accelerate rapidly, increasing mileage if it overcomes the probably slight reduction in efficiency. Plus you have a significant reduction in drag. However, you have more hills. Some owners of other brands do report significantly higher mileage at high elevation in vehicles that can compensate fueling for the reduction in O2.
    "From a little spark may burst a mighty flame." - Dante
    "The stitch is lost unless the thread is knotted." - Italian proverb

  15. #239
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    Quote Originally Posted by lokey View Post
    My car tells me that I get 38 mpg.
    Wow! I guess with really moderate driving right? What RPM do you normally shift at?
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  16. #240
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    Quote Originally Posted by rexload View Post
    My MPG meter never showed more than 19mpg even driving on the highway at constant speed for 4 hours.
    Only 1,500 on the car.
    I will calculate it myself to see if the mpg meter is accurate.
    But that is awfully low mpg.
    Just do it the old fashion way. Get a full tank, start the trip calculator. When you fill up, just figure out the difference.
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