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Power/Mileage With Loss 275/60/20

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Old 09-15-2009, 09:43 PM
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Power/Mileage With Loss 275/60/20
I am thinking of going from my stock wheels/tires to 275/65/20s (a/t tires)and was wondering what kind of mileage/power loss you guys have experienced. Was hoping to pick up some milage at 75mph, without too much loss around town. The truck has a g56 and 3.73s. Thanks.

Mike
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Old 09-16-2009, 09:27 AM
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I hand calc my mileage on a 1800 mile trip,avg 18mpg us at 70/75 mph.I had to keep the rpm under 1950 or the mileage would head south.
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Old 09-16-2009, 08:28 PM
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Thats not too bad. I get about 16.5mpg at 75-78mph empty. Thats 2500-2600rpm. Did you notice a power loss with the larger tires?

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