could just be me, need opinions..MPG
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This is a discussion on could just be me, need opinions..MPG within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; hey guys, went on a long drive yesterday and I just felt like my car was guzzling gas..I was driving ...

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    could just be me, need opinions..MPG

    hey guys, went on a long drive yesterday and I just felt like my car was guzzling gas..I was driving aprox. 73-75 mph and was running at about 3500 rpm's. is this normal? just felt like my tank was gone in no time..just want your guy's opinion/experiences..thanks a lot

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    Registered User shadowpr's Avatar
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    driving like that in my 09 will definitely lower my mpg.

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    Registered User poly_poly-man's Avatar
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    Try doing the mpg calculations. Driving like that will lower your mpg. Do the calculations to see what works and what doesn't, and how bad you're doing.
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    Registered User metaldahlberg's Avatar
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    Ya. At 3500 rpms you are definitely in boost. Cruising at that speed will reduce mpg a lot. If I want good gas mileage in my 2010 I stay below 3000 rpms
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    Registered User 06scoobyrex's Avatar
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    Were you in 4th or 5th gear?
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    Registered User d_Ziggy_2000's Avatar
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    See what the ratio of rpm to mph is.. My car runs best on around 65mph or so at around 2800 rpm.. If I get up to 70, I hit about 3k rpm.. However to 75 its like 3500 rpm.. So the difference there is quite substantial..

    But that's just my two cents on that.. (more like penny and a half actually)
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    Registered User djclue8713's Avatar
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    For me, below 3k and I get ~24 mpg. Anything above that, I get 20 sometimes lower if I'm feeling spirited.

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    Registered User teflon_jones's Avatar
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    Wow what year is your car?

    I never realized a WRX would be at 3500 rpm at that speed. It badly needs an overdrive. Glad I have a 6 speed at 80 I'm at 3000.
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    Quote Originally Posted by teflon_jones View Post
    Wow what year is your car?



    Were you in fourth gear? At 70 mph, my 2003 is right about 2900 rpm. Driving as you described will definitely impact your milage. At freeway speeds, I try to keep my rpms as low as possible. I get around 26 on the freeway, and about 21 around town.
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    don't want to have to quote all of you so I'll just answer them all aha

    but it's an 05, and I was definitely in 5th gear. I was surprised myself how high the rpm's were...to stay below 3k I have to be going like 65mph or less..just seemed weird to me, didn't know if anything mechanically could be wrong..or if that's just how it is. guess I'll have to drive like a grandma to save gas :/

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    He simply abides. SD_GR's Avatar
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    Do you know the history of the car? The gear ratio does not seem stock.
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    OMG WTF MainFrame's Avatar
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    Quote Originally Posted by metaldahlberg View Post
    Ya. At 3500 rpms you are definitely in boost. Cruising at that speed will reduce mpg a lot. If I want good gas mileage in my 2010 I stay below 3000 rpms


    Only in boost if you're accelerating. You can cruise at 6000 rpms and not be in boost.




    But I digress.. I tend to get the best mileage driving ~60mph.

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    Quote Originally Posted by SD_GR View Post
    Do you know the history of the car? The gear ratio does not seem stock.
    unfortunately I don't :/ how could I figure that out?

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    He simply abides. SD_GR's Avatar
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    Post speeds at specific rpm for each gear and ask other members with the same model to compare.
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    Quote Originally Posted by teflon_jones View Post
    Wow what year is your car?

    I never realized a WRX would be at 3500 rpm at that speed. It badly needs an overdrive. Glad I have a 6 speed at 80 I'm at 3000.
    The six speed has closer ratios, but the same final drive and STi 6th and WRX 5th have nearly the same ratio (0.756:1 6MT and 0.738:1 5MT). In short, 80mph in 6th should be the same revs as 80mph in 5th on the WRX.

    Quote Originally Posted by MainFrame View Post
    Only in boost if you're accelerating. You can cruise at 6000 rpms and not be in boost.
    This. Boost depends on load, not RPMs.
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