I recommend diesel. They cost a little more in maintenance, but I believe they will last longer is taken care of properly. The power is unreal and the mileage is good for a truck that heavy. i have a 2008 Duramax, and will never go back to a gas again. This might even be the last truck I buy. 65K and still strong.
I have it programmed with a 4" turbo back. So my mileage is a little better without the smog stuff on it.
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Travis
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