Re: 20 MPG

Posted by mkirsch on April 28, 2011 at 10:00:33 from (64.80.110.75):

In Reply to: 20 MPG posted by Bob on April 27, 2011 at 21:22:14:

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Larger tires are also wider and heavier. They have a larger contact patch with the ground, and in the case of pickup trucks, they also tend to have more aggressive tread patterns.

Hence, increased rolling resistance.

Regardless, a taller tire will require more torque to turn it. That is simple grade school physics that you can take to the bank.

There's a "sweet spot" for each vehicle where the tire height best matches the drivetrain (engine, transmission, differential) and driving conditions for best efficiency.

Whether you go larger or smaller in tire size, it causes the engine to operate outside its peak efficiency RPM range. Too large a tire causes lugging and downshifting. Too small a tire causes the engine to "over-rev."

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