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I bought new my 2007 Chevy Silverado with 5.3 litre and 315 HP to pull my Nash travel trailer. When not towing, the V8 will beat any V6 offered in MPG. Taking advantage of the offered fuel management system is the key. On the dash, the display will indicate when you switch up or down in cylinder cutout. With a simple glance at the dash you can control your foot to keep the engine in 4 cylinder operation. You cannot feel the changeover. It is flawless in its operation. That is how I could easily bring in 26+ MPG on the highway brand new on the New Jersey Turnpike at 65 MPH and even on small country roads it is easy to hit mid twenties. The next training feature as I call it is the instant MPG display. Once you have trained your foot to not be a lead weight, the next step is to maximize the MPG. Instant MPG is accurate. The trucks's computer always knows exactly how much fuel is entering the cylinder. It also knows exactly how far you have traveled. So as I'm traveling down the highway, the majority of time I am in instant MPG mode on the dash. My method works and I can always beat the EPA rating by a wide margin.
For those who like to coast, the instant MPG readout really makes you feel good. Instant gratification 99 MPG going downhill coasting.
The V6 did not offer this feature of fuel management. Plus is could not tow my Nash trailer or more correctly was not designed to tow so much weight.
GM has had the best design for economy for several years. They don't get enough credit for this.
Not that I did this but this engine can really haul A**.
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