Quote:
Originally Posted by mcrews
cargo,
can you show us your tests that verify this.
it runs contrary to my tests and those of others.
smaller DIAMETER of tire results in HIGHER RPM at cruise speed. Higher rpms result in lower gas mileage.
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The test that I used was the simple fill up to first stop and then use a full tank of gas from a 0 trip odometer and then fill the same way and then divide the trip odometer by the gallons on the pump. This was on a Nissan Versa 4D 1.8SL CVT(which helped) going from a 225/45/17 (summer tires) to a 195/55/15 (snow tires) and consistently showed a difference of 3mpg exactly, 30 to 27 respectively. Even with a difference of 1.6" on a non CVT car you're only talking a difference of a couple hundred rpm which is negligible.