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When I swapped from 205 50 R16 to 205 65 r 16 on a car I used to have (7th generation celica), mpg shot up but that was due to tire choice not size. I later swapped on 195 65 r15 and mpg basically stayed the same. Michelin energy saver tires both latter sizes. I had to remove these thin plastic inner wheel wells to fit the larger tires. I also had more aero wheels the second time. Those seemed to cancel out the better gearing.
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