Cummins12V98 wrote:
"When towing, whatever gear keeps engine rpm between 1,800 and 2,000 rpm will give the best fuel mileage and power because that is the rpm window where the Cummins 6.7-liter makes peak torque.
I tow at 60 with rpm's about 1,750. Just right! That's with 4.10's. At 70 I am about 2,000.
With my last DRW I had 3.42's. I would tow in 5th at same rpm's as above, just right!
Sounds just right. What is your fuel economy at 60 mph and 30,000 lbs combined? How many lb ft of torque was your last DRW?
