Hi folks, my '07 2500HD with the 6.0L gas had gotten down to 6.0 MPg according to both the trip computer and back of the receipt calcs. Towing OR unloaded!
I get it... The 6.0 isn't purchased for mileage, but 6mpg was something wrong.
2 weeks ago I had my mechanic install a cold air intake kit and do a full tune up with new plugs and wires. That got me up to 7.5 MPG.
While towing home from last weekends trip to lake Sebago, the truck finally threw a check engine light.
I brought it in, and when they pulled the codes, they found some serious computer problems.
So, they did a crank relearn. Unloaded on a nice 55 mph state route last night I saw 15 mpg! The crank relearn doubled my mileage.
Labor Day is my next tow with the camper. I'm hoping for 10 while towing.
2007 Chevy 2500HD crew
2015 Jayco Jayflight 32BHDS