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From my understanding here on the ecomodder forums, Taller tires are better for Highway /freeway cruising, but can hurt city driving quite a bit. So if your commute is 80% Highway/freeway and 20% city you might see a gain. If it's vise versa, it will hurt your mpg. I can vouch for that. I'm 2 sizes bigger on my insight (not by choice) and I struggle to maintain 55mpg in the city when most hypermilers can get ~65-70.
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