Quote:
Originally Posted by MMC
My 2014 Silverado with the 5.3 got a best 50 mile average economy of 24.9 mpg. more than the EPA rating, this is a regular cab Z71 4x4.
My average over the life of the truck is 19.7, mostly urban driving. 
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with my Ecoboost, if I keep it under 65 mph it'll get 22mpg all day long.. that's with about 200 lbs of stuff in the bed, 22s, and random stuff on the inside..
I gained at least 1 mpg with the Livernois tune..