Quote:
Originally Posted by t walgamuth
The extra weight is negligable to mileage but will make it ride rougher and not grip the road as well on bumpy roads.
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Tom,
What I meant was that on take off it would be affected as more mass to get turning . . . but would probably work out to .001 mpg (depends on how often one took off from a start . . . aso larger diameter tires would also reduce acceleration, so you would use more fuel to get up to speed, but . . . once up to speed . . . you could gain it all back and then some, assuming one stays at highway speeds for the majority of the time.