I have one with the 5.3 with the AFM. I love it! But, as mentioned above, its not going to stay in 4 cyl unless its flat and you can feather the throttle to keep it in that range. You lightest touch can shift you into 8 cyl quick. On the freeway when I'm cruising, I don't think I've ever seen it below 19 or 20 mpg. But it is pretty flat here in coastal Texas. I can't say much for the rebates, I bought mine at the end of the year and there wasn't much at the time. I've never been a chevy guy, but I do love this truck.
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