Have an 08 but with 3.73s. Got 15-16L/100km with highway tires, when I put slightly bigger more aggressive ones on it went to 17L. Pulling a 6500lb travel trailer I get as low as 23L/100 with no wind on the Prairie and 26-28L through the mountains.
I like the 3.73s for daily driving but when hooked up I wish I had 4.10s as I'm almost never in high gear
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