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This is an interesting thread. I too thought about increasing the size of my tires (needed to be replaced anyway), but oped to go with factory since the gearing isn't bad.
On past experence prior to ecomodder... my dad owned a 1992 Buick Century with a 3300 v6. His tires were about shot, and going on the cheap, a I had a 92 chevy lumina I was scrapping out with good tires. The lumina's tires were taller and quite a bit wider, enough to hit *something* when turning really shape around corners or parking lots. He claimed a MPG loss and it took off slower. He wasn't exactly an eco driver though, and I don't have any good tracking/numbers to give. He probably didn't count for the tire size change, and the mpg drop wasn't enough to bother getting different tires (like 2-3mpg drop, car normally got like 26mpg). I'm pretty sure the tires were 8-10% taller.
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