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[Believer45]

Do you know what gears you have in the truck? Also, what year is it? You may want to fill out a signature in your profile to let folks know what you are driving.

In my experience driving habits have a lot to do with mileage. 70-75 MPH is not in a fuel sipping mode for most of these trucks.

I drive like an old man. Never use more than 1/4 throttle, shift at 12-1300 RPM, set cruise at 57 on the interstate (@1600 rpm), drive like I have a full glass of concord grape juice sitting on a piece of carpet in the bed that cost $175,000. As a driving for economy philosophy, brakes are the enemy. Any time you use your brakes you are spending brake money to scrub off speed you spent fuel money to build up. Plan your stops, turns, etc. to avoid wasted fuel. This kind of philosophy took me from 17.5-19 to ranging from 21-23 mix of interstate and surface roads (personal best is 24.5 all interstate, cruise set at 57 mph). Since I had this particular increase I have added 500 lbs of tools and a 300 lb 3 foot tall contractor cap, spending 3/4 of my time for the last three months pulling a trailer weighing from 3000 - 5500 lbs. working a handyman business I have opened. I am still getting 18-19 mpg on 100% surface roads. My truck is wondering if all the interstates have been closed.

Also how wide are your tires? I went from 255/85x16 to 285/75x16 (within 1/10 of an inch in diameter of each other but the 285 is significantly wider) and lost 1.5 MPG - I am going back to 235/85x16 as tires wear out.