umm Good idea with those silverados SLOW DOWN that'll increase it just in itself stay at 60-65 instead of 70-80 on the highway. Lowering it will definately help A turbo would make that truck very fun and also it would save quite a bit of gas. make sure your tires are filled porperly and definately get some kinda cover for the bed
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Tank:
(No actual EPA numbers for car just used F/E numbers when i first got it)
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