Poor gas mileage...
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This is a discussion on Poor gas mileage... within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; I have a 2004 WRX that's tuned Stage 2 with the COBB AP. I filled my tank completely,reset my trip ...

  1. #1
    Registered User
    Join Date
    Sep 2011

    Poor gas mileage...

    I have a 2004 WRX that's tuned Stage 2 with the COBB AP. I filled my tank completely,reset my trip meter, and ran it until it went to the empty light. my odometer read at 200.4 miles.

    I know the tank size is 15.9 gal and the Light probably comes on with about a gallon or more in. So that equates to roughly 14.5-15 gallons of gas used only getting 200 miles = 13.3mpg!

    Is this normal to see such a radical drop off in fuel economy?

    The vehicle has 94,500 miles on it.
    Mods include: Invidia down pipe, Invidia up pipe, HKS catback, STI intercooler with samco hoses, and Grimmspeed Lightweight Pulley. and like i said before i'm stage 2.

    Also i just recently changed the fuel filter and used some fuel system cleaner with no change.

    Lastly i wasn't driving the vehicle hard either. I made a point to drive the optimum speeds on the freeway and never really pushed it hard during acceleration.

    Any help or thoughts on the issue would be helpful, thanks!

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  3. #2
    Master Baiter EJ257's Avatar
    Join Date
    Aug 2007
    On a stream bank somewhere
    I Support ClubWRX
    All maintenance up-to-date?
    2016 Toyota Tacoma TRD Off-Road - Daily
    2005 WRX STi (Mods | Virtual Dyno) - Weekend Warrior

    Resident Tuner @ WTF Tuning

    "Never trust anything that bleeds for a week and lives ..."


  4. #3
    Registered User
    Join Date
    Sep 2011
    yes sir. I did some google searching and i saw that Subaru's gas light might come on early? i saw one guy say his comes on when he's only used 9 of the 15 gallons used. if thats the case i'm getting average mileage. 21-23mpg but how true is that?

  5. #4
    Registered User jd92677's Avatar
    Join Date
    Jul 2010
    Did you fill the tank back up to see how many gallons you actually used? That would be the most accurate way to calculate mileage. How long has the fuel mileage been bad? Is the car new to you?
    Stink eye mob #727
    2011 WRX DGM Hatch, Protuned Stage 1

  6. #5
    The Default One SeattleJeremy's Avatar
    Join Date
    Jul 2004
    Seattle, WA
    miles driven / gallons used = MPG.

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