08 6.4L 4x4 Crew Lariat.
Last weekend I hauled my 32 foot 5th wheel.
With TH turned off I was getting about 9 mpg. Zero power as well.
With TH turned on I was suprised to see the mileage go up to around 13 mpg.
It seemed to run at around 2k rpm with TH on which seemed to be more in the...