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I learned that even slightly larger tires make a big bite out of milage. The stock 275/65 18 tires gave me an averrage of 20.1 over 6500 miles. I drive almost all highway or 55mph back roads.
I put 275/70 tires on it and the milage dropped to 18. You need to check your odometer against a GPS or just do the math. These tires are 33.2" so when the odometer says you drove 300 miles you actually drove 309 miles...a 3% difference which is worth an extra 1/2 mpg. Those with 35" tires are driving alot further than their odometer or computer indicates so the milage may not be as low as you think.
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