GMC 5.3 or 6.2 Liter Engine?

wildwest450 wrote:

The Texan wrote:
The only trouble with the "movie trailer" is the lack of using facts about mileage. In the real world, the 6.2L is getting the same and in many cases, better mileage than the 5.3L, so mileage is NOT a factor.

Gm is claiming a best in class 23mpg for the new 5.3, I see no such claims for the 6.2, perhaps you can provide some proof?

Go to the GM forums and look at the reports posted by actual owners. The GM claim for the 5.3L is a joke and the actual mileage being reported by most 6.2L owners often tops the reports posted by 5.3L owners. I know we are getting 19 on the highway at 70 and over 20 when I slow down to 59/60.