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It may not be that clear cut. Take this reverse example. My metro stock tires were 155-80-13. I went to 175-65-14 and lost 3~4 mpg. But the ride, handle and look are quite a bit better. I agree that 13's probably wouldn't fit over your brakes.
But I'm not convinced that 175-65-14 or something wouldn't be just fine. Only if you need new tires. Cost of changing tires just for mpg purposes is ridiculous, you never save enough gas to pay for the tires.
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