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On long highway runs keep it under 70 and you will see lots of MPGS! This is on the 8-speed
Now that the temps have fallen below freezing, here in Indiana, I'll be lucky to see 17.
I have 4wd, otherwise same as yours, get same mileage as well. Sometimes I get 22 keeping at speed limit on Utah freeways, except where it is 80 mph, then I stick to 75 in the slow lane .Going 75 MPH I've only achieved 21 MPG max. 5.7 V8 Crew Cab, 8 Speed, 2WD, 3.21 gears, tires (Goodyear SRA) at 40 PSI. I have running boards and a cargo box. I live in Florida, so very little incline changes.
If I take back roads going 55-60 MPH, my mileage goes up to about 25-26 MPG.
City driving stays right around the EPA estimate of 15.