Gas efficiency and RPM - Page 2
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This is a discussion on Gas efficiency and RPM within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Originally Posted by poly_poly-man ..even if you're talking a steep uphill which requires WOT at 2k. Now acceleration is a ...

  1. #16
    OMG WTF MainFrame's Avatar
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    Sep 2002
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    Quote Originally Posted by poly_poly-man View Post
    ..even if you're talking a steep uphill which requires WOT at 2k.

    Now acceleration is a different matter altogether.

    That's contradictory.. because driving up an incline is accelerating in a sense, even if RPMs are kept constant. I have the feeling WOT at 2k RPM is going to consume much more fuel than 7% throttle opening angle at 5k RPM.. when I get my car back I can test it and post graphs of IDC to see.

    Think about the Top gear episode where they proved a Prius gets worse mpg than a M3 driving at the same pace..

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  3. #17
    Registered User poly_poly-man's Avatar
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    Feb 2010
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    The problem I have with that top gear episode is that they're fundamentally different cars, with completely different everything.

    I'd really like to see that test done, actually - I may figure out a way to do it myself.

    BTW, making sure I'm clear on this - the IDC for the 5k situation would be lower than the 2k situation, but has to be multiplied by 5/2, since there are 5/2 times as many injector firing events, right?
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  4. #18
    Registered User Chance1218's Avatar
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    Mar 2012
    Quote Originally Posted by michaelwfox View Post
    I shift at 2.5k and cruise on the highway at 65mph (speed limit here is 55 anyway lol). I'm averaging 24-27 mpg.

    Not that mpg even matters

  5. #19
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    Jan 2005
    Canada B.C.
    I have been watching my ScanGauge and how my gas mileage if effected by how I drive for the last 7+ years, and without fail I ALWAYS get better MPG when I shift early and keep the RPMs down... Now I'm sure there are "some" situations that higher RPMs may work out just a little better but generally not...
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