My new truck now has about 10,000 miles, weather is warmer and my mileage is still in the 13 to low 15mpg range. Doesn't seem to matter how I drive it, it stays the same except when I drove from NH to Utah towing 2 buggies to go rock crawling, then I got 8.1 average but I was heavy at 23,000lbs. My 99 used to get 18 most of the time or better on trips. Wondered what others are getting?

 

Most powerjoke guys I talk to are getting the same mileage as you are. approx 14-18 unloaded and lower loaded. I sort of chuckle at the face they make when I tell them that my Dodge Cummins with 3000 miles is getting 20 mpg at the moment. And will get even better as i break in the engine.

 

I'm getting around mid 16 to low 17 range now and this last weekend I towed 8000lbs and still got 16.7 with it. This is what I was expecting from the beginning. Not sure what changed except now the check engine light is on and i'm scared to take it in for service.......