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How much of a decrease in mpg's with bigger tires

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Old 10-30-2007, 08:29 AM
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depends on your gears... i know when i went to 35s with the 4.10s, once the speedo was re-calibrated i noticed a slight increase. since they brought the rpms down, its helped...
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Old 10-30-2007, 08:30 AM
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Does putting on 315 70R17 require any lift at all to avoid rubbing of the tires or does the stock set up work with this size?
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Old 10-30-2007, 10:06 AM
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Originally Posted by roadrnnr2007
Does putting on 315 70R17 require any lift at all to avoid rubbing of the tires or does the stock set up work with this size?
in the rear you should be fine, in the front you will rub somewhat.
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Old 10-30-2007, 12:26 PM
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I didn't do any lifting of my truck. I even have the OEM molded mud flaps and there is no rubbing with my H2 Hummer wheels and tires.
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