Originally Posted by 2010laramine
I've got a 2010 CC 4x4 Laramie with 3.55s. (Tire size is 305/55/20s) I recently drove from central TX to southeast AL and back along I-10 and didn't encounter any gear hunting and with the cruise set at about 80 I averaged about 16.9 for the trip and that was including a week of "City" driving if you call Dothan a city
I also wasn't towing anything and the highest MSL altitude was about 400 feet.
My wife just went from Hamilton Tx to Dothan Al in her 13 grand caravan via I20 and avg 28 mpgs.
I have a 4.7L with the 3:55 gears and on my longest trip so far ( about 100 one way miles and the truck hasn't past 1500 miles yet) I averaged 19.6 doing the math I filled up right before and right after. It seems like my mpg computer is accurate if set at the beginning of the trip. I didn't notice any gear hunting in the Tax hill country it would shift to 5th on some hills and in a couple big hills it went to 4th but it didn't need to find the right gear it just shifted down as needed then back to 6th gear. Overall I am happy with my gears.