Falling out of love with Duramax

[outdoorsman]

I have the ecoboost, 4x4, 3.73 gears, 6.5' bed, can tow 11,300lbs! If I keep my foot out of it I get 16mpg in town 18-20 mpg on highway. Last trip was to Florida, 19mpg. The torque on this truck is unbelievable, really fun to drive. Like any half ton the mpg goes way down while towing. There is 2trip meters on the display. One I have been running since the beginning of the year, 15.8 mpg 380 gallons used, I do a good bit of towing. The other I reset every tank, currently 19.8 mpg 7.1 gallons used. I have checked the meters on occasion and the most they have been off is +\-.5mpg.