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Re: poor gas mileage
I suggest using the original size tires and rims for your truck. I just bought my first truck a 2001 Sierra K1500. The vehicles are the same just the nameplate is different. You might want to also remove the tailgate and install a net or louvered plate in place of the gate. Something I learned with the vortec V8.....keep your feet out if the injectors. I am getting 16 around town and 18 on a run.
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