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The taller you buy your tires the thinner the tire you have to buy to maintain/improve fuel mileage , i was running 245/75R16 on the chevy getting about 16 mpg in town and highway mix, when i went up to 285/75R16 it dropped to about 14, thats alot of tire meat to push around , it was the same way on my 1990 chevy, and my beretta, but imagine if you went with a taller tire with less width , you have less road contact to rubber while maintaing your lowered gear ratio
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