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Old 06-08-2008, 02:12 PM   #6 (permalink)
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Join Date: May 2008
Location: Canada
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Fortuga - '03 Subaru Forester X
90 day: 21.68 mpg (US)

The Beater - '94 Nissan Sentra EX
90 day: 28.88 mpg (US)
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Originally Posted by Big Dave View Post
Literally hundreds of pickup drivers report that going to bigger tires makes their MPG go down.

The rotational moment of inertia goes up with the square if outside diameter increase. that makes you accelerate four bigger "flywheels" as you leave every stop light.

If you want to slow the engine down - a valid fuel economy practice - slow down or regear.
Have those hundreds of pickup drivers adjusted for the offset odometer reading of the distance travelled?

Also, outside of stop and go traffic, wouldn't those larger flywheels be beneficial, like on the highway?

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