I had an 01 1500HD crew cab. It had the 6.0. It had the dreaded "piston slap" and sounded like a deisel for the first five minutes when you cranked on a cool morning. The best I ever got out of it was 11 mpg in the city, though 8-9 was more likely if your foot got heavy. It would get 17 mpg on the highway empty, but would go to 8 mpg on the highway pulling a large enclosed trailer...8 x 8 x 20. I was never too impressed with it...I bought a motor home to pull the trailer and it gets almost as good [?] mpg.
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72 GMC Sierra SWB almost finished---- 84 Softail
Olive Branch MS
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