Whats your gas mileage looking like? Before i made the swap from the stock 18s to 20x9 w/ 275/55/20 Terra Grappler G2's i was getting 18 city and 22-ish hwy. Now Its barely breaking 13 in the city with maybe 17hwy. Ive yet to get the recalibration done because apparently the dealership "can't find my VIN number" when they scan it to do the calibration (why does that matter?). I did get an alignment though, so thats covered.

Anyway, I'm not running a super aggressive tire, and I'm not running a wheel thats horrifically different from the stock 20 setup outside of the zero offset. I know the standard answer revolves around "its a truck, deal with it". But i cant fathom how the fuel economy would be hit this hard.

Any thoughts? Cheers