As much as I love my truck (silverado 1500 with a 5.3) the gas mileage is terrible. I use it for landscaping, so I am constantly pulling a landscape trailer with a couple mowers, which really isn't all that heavy at all. But the mileage drops off a lot, although I've never really calculated the difference. For towing every once in a while, a 1500 v8 would be plenty of power, and a little fun to drive too. But don't expect much in terms of gas mileage with or without the trailer. I'm aiming for a diesel next time around myself.
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