Forum Discussion
Thom02099
Dec 28, 2017Explorer II
I have a 2007 GMC Sierra SLE 3500 dually, duramax/allison combo. On a recent trip to the Grand Canyon, my fuel economy was in the 10-13mpg range. On the last leg coming home, in the Colorado mountains including Wolf Creek Pass, I got 12.8mpg. Going across the high desert of northern AZ, got 10.6-11mpg, at 62mph. That sure as heck beats what I would have gotten with my 2003 Chevy Tahoe; would have been lucky to get 7-8mpg towing the same trailer.
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