This truck is #1 or 2 on my list of my next truck. How is yours specced and what kind of mpg are you getting?
I specked mine with an efficient drive train, PACCAR MX13 455hp multi torque 1550/1750 split, PACCAR 12 spd tranny and 2.79 rears. June 6.7 July 6.9 So far average is same a bit better than my T660 was with similar specs. Based off of my experience with my previous truck, I expect my fuel economy to increase as the drive train breaks in. First overhead is done at 60,000 mls, that’s about when I noticed performance and economy increase in my last truck. I normally set my cruise at 68, sometimes 70. Mixture of heavy and light loads throughout the month.
i have a 565 HP 15L Cummins in my T880. 4.27 gears, with Allison 4500 trans. my on highway average fuel use is 6.9 MPG. but the in town driving fuel use drops to around 4.8 MPG.