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Re: 5.3 Sierra towing
No truck will get great gas mileage but if you add things like an aftermarket exhaust with headers and adding a K&N filter will help. I would buy the Hypertech power programmer, I have one and I got about a 17% increase in fuel mileage unloaded. Another factor to consider is say you have the 4:10 gears, are you running a stock height tire or something taller? A taller tire will reduce your overall gear ratio and reduce your cruising rpm as well. I would pick the one with the lightest weight and biggest engine. The 6.0L will make more torque and move you much better than the 5.3 can.
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