could just be me, need opinions..MPG - Page 2
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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; Check your tire pressure. Driving 55 mph will get better mpg's than driving 70-75 mpg's. Has to do with the ...

  1. #16
    Moderator Donkey's Avatar
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    Check your tire pressure. Driving 55 mph will get better mpg's than driving 70-75 mpg's. Has to do with the drag coefficient/aerodynamics of the car.
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  3. #17
    zax
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    Quote Originally Posted by Donkey View Post
    Check your tire pressure.
    Correct me if I'm wrong, but won't tires also have an effect on fuel economy? Wider, stickier tires increase rolling friction thereby decreasing fuel economy...

    Quote Originally Posted by Donkey View Post
    Has to do with the drag coefficient/aerodynamics of the car.
    This. The force of drag is proportional to the velocity of the object squared. That is, the faster you go, the car experiences an increased nonlinear backwards force.
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    Registered User jd92677's Avatar
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    Quote Originally Posted by zax View Post
    Correct me if I'm wrong, but won't tires also have an effect on fuel economy? Wider, stickier tires increase rolling friction thereby decreasing fuel economy..
    Absolutely, this week I swapped my winter tires for my summers and it increased fuel economy by at least 2-3MPG. And to the OP, it sounds like your gearing has been changed, 3k RPM in my car is 75MPH, 3500 is near 90MPH
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  5. #19
    zax
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    Quote Originally Posted by jd92677 View Post
    Absolutely, this week I swapped my winter tires for my summers and it increased fuel economy by at least 2-3MPG. And to the OP, it sounds like your gearing has been changed, 3k RPM in my car is 75MPH, 3500 is near 90MPH
    I figured it would be the other way around summer tires have increased contact patch and stickier rubber, hence more rolling friction
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  6. #20
    Registered User jd92677's Avatar
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    Quote Originally Posted by zax View Post
    I figured it would be the other way around summer tires have increased contact patch and stickier rubber, hence more rolling friction
    They are wider (235 vs. 215) but the tread is much more aggressive to dig through the snow, so there is much more rolling resistance on a winter tire
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