Quote:
Originally Posted by oil pan 4
A 2cm taller tire will get you some where around 3 to 4% more miles that what the odometer shows.
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A few years ago a friend of mine switched from 175/70 to 185/80 R14 in a trucklet he still owns. He didn't notice any mileage improvement and went for the larger tires in order to imcrease ground clearance. I guess the largar tires being wider and of some obscure Chinese brand deny most of the increase which could be expected to fuel savings.