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Discussion in '1992-Present Chevy & GMC models' started by Bhintz, Jun 26, 2004.
what type of MPG are you getting w/ your 8.1L, and did you do any upgrades that improved it
My mom has one in her Yukon XL, it's averaging 11.2 MPG. None of us that drive it are very easy on it. No upgrades yet, but this thing is pretty quick stock. /forums/images/graemlins/thumb.gif
i've got a standard cab 2500 with the allison and 285 big o xts and around 10 is the best i do BUT who drives a almost 500 cube motor nicely?
I've got an '03 Sierra 2500HD crew cab with an 8.1 and the six speed manual. I get 14.5 to 15 mpg on the highway at 70-75 mph and the a/c on. The only thing I've added is a K&N filter. I also run Mobil 1 oil and a PF-1218 filter.
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