2006 Duramax Dually 4x4 pulling 25' Thunder - I get 14mpg - Delivered a 33' cross country to Havasu and averaged 12.1 including crossing the rockies. U should be able to average 11-12 I would think in an 07 Goat :evilb:

I towed my 37 with a F350 Crew Cab Dually 4X4 with the 7.3L Powerstroke and got 11-12 running between 65-75. I had a Diablo 3 setting chip and ran it in the power (not performance) mode. Great truck for towing:drink:

With a gas motor pulling a 32, I would plan for 8-9 for stops and hope for 10-11.

The 6.7L is a Cummins diesel, not a gas burner. However, it's loaded with tons of new EPA crap to make it burn cleaner. Put it this way, I have 22k miles on it and the inside of the exhaust tip still looks brand new on a diesel. I'm all for being clean but it really cuts the mileage down.

I guess I have been lucky, I have not had one single problem with mine yet and like I said above, 22k miles and ticking. I looked at a 5.9 but just decided to try out the newer model with the exhaust brake and six speed auto tranny.

Did that wake that beast up?? :evilb:

The edge chip woke up my 03 7.3 power stroke on the lowest setting and i picked up 4 mpg in the process.:drink: