Posted by Ken in MN on November 27, 2007 at 16:38:42 from (64.136.49.227):
In Reply to: 2003 GMC 2500HD 8.1L posted by Matt Weltz on November 27, 2007 at 14:49:13:
I have an 03 2500HD with the 8.1, allison, ext cab shortbed 4X4. The best I can get for mileage around here in north central MN is high 10's. Last july The wife and I went to southern MO on vacation, down there I was getting around 13.8 mpg, with a best of 14.9. As we were driving home, the closer we got to home , the worse the mileage got. Still have not figured that one out. My truck will do slightly better with 89 octane versus 87. I have never used a programmer, but have heard that hypertech is not a very good one for these engines. Check out dieselplace.com, there is a section for "gassers" that has some useful info.
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