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best I am getting with my 09 6.2L 4wd is 16 hwy 14-15 in town. I think to get better than 16 you have to keep speed under 65. Anything over and MPG drops fast.
I notice that with the 5.3 as well (20-22hwy and 14-18 city, but if i'm on cruise control anywhere from 45-55 I average 22-26). However I blame that on the gearing. Isn't the 6.2 a 6sp auto?