Got a new Kenworth T680 a few months ago. I was hoping to have less maintenance, less downtime and get better fuel savings, and that those things would offset the higher payment compared to my 2006 International. So far the fuel mileage is about the same as the old truck.
It has 485 HP Cummings motor, a manual 13 speed Eaton Fuller transmission, 358 rears end and 144" wheelbase. Rides really well.
I now have 33,000 miles on it and the fuel mileage seems to be
getting better but nowhere where I hoped it would be. I hoped to get
6.5mpg at minimal. I'm averaging 5.8 to date and that is with me idling
at night to keep cool. Cooler weather is coming so I hope to improve my
mileage to 6.5 or better this winter.
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