In California with a 55Mph speed limit and cruise set at 60 mph I experienced a high of 7.2 mpg (500 mile trip towing GMC Envoy with a 45' Newell w/2007 CAT C-15 ACERT prototype and 12 speed ZF ).
Worse MPG was in the mountains with pedal to the metal and an average 5.4 mpg.
Engine was new and I suspect mileage would improve after 20-30K mileage break in.
JohnC
