Compression Ignition Addict
Join Date: Apr 2007
Thanked 37 Times in 31 Posts
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I have gotten between 11 and 12 on the highway as an average - the best I can tell. I generally will not go past 65 mph, and will probably stay just under that. My trailer is apprx. 6500 lbs. and my loaded truck is apprx. 9000 lbs. Stop-and-go driving while towing is a HUGE killer on fuel economy and I am taking that out of the number I posted. Also, the wind resistance (if you are facing anything over a 10+ mile an hour headwind) and elevation changes will cause these numbers to drop like a rock . My electronic mpg gauge is not accurate, but it appears consistent. It is ALWAYS 1.1-1.4 mpg higher than actual. On long trips, several times I have reset it on the highway and tracked the fuel economy on flat stretches with minimal wind.
My numbers are using the tow/haul feature while towing AND it seems that the best economy is without cruise control (unless the terrain is very flat). Cruise control will throw the fuel to it as you climb hills. Now, I try to gradually speed up before a hill and I do not mind a few mph drop during the climb.
That being said, when you are in a hurry it is great to have the power for high speeds, climbing hills, etc. It is just at a big fuel penalty.
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Last edited by bismic; 12-15-2008 at 04:25 AM.