My GN has a chip and hooker exhaust, that's it. Going to work and back I would see around 20 but on the trip from Cali to Missouri it consistently got over 30. First tank was 33 and I didn't believe it, but when the second was 31 and the third 32 I was sold. This was driving at 65-70 and my dad was not drafting my truck n trailer. I had one bad tank of gas that dropped it to 22 and my truck to 8 but the rest were high. I know some won't believe me but that is going off GPS for the mileage.
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