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Thinking Of Buying 07 Sierra Please Help


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I have a 2WD 2007, I get about 16/19 city/highway mileage with 255/75-17's and 3.73 gears. I would suspect 35's would drop that considerably just due to the added weight and rolling resistance of the off-road tires.

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I have a 2WD 2007, I get about 16/19 city/highway mileage with 255/75-17's and 3.73 gears. I would suspect 35's would drop that considerably just due to the added weight and rolling resistance of the off-road tires.

 

According to the BMW magazine that I read, the 3-series sedans fuel economy is 40% caused from rolling resistance + the fact the tires are compressing air as you roll forward.

 

Bigger tires = lower fuel economy, but I don't know by how much.

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