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With a GPS confirmed adjustment factor to the odometer, my overall on-road mpg went up nicely on a 2002 I-6 Jeep Wrangler when I swapped my stock tires for some taller and wider mud tires. I fully expected the opposite (due to weight, rolling resistance, frontal area), but apparently the effective change to the final drive ratio superceded the rest. My 2003 Jeep also saw improved mpg even though the tires were a lot taller and wider, and this one had a 5.5" suspension lift as well.
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