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I'm seeing 16-18.5 unloaded driving between 8500' and 5500' elevation, mix of highway & in-town driving. Currently 5200 miles on the odo. 3.55 electronic locking rear.
I did a trip to sea level, towing a 20'x8.5'x8.5' enclosed trailer, 15,000 lbs gross, 82mph highway, 10-15 mph cross wind - got 9.6 mpg. Coming back on a leg gradually going from sea level to 4500' elevation, with 20-30 mph headwind, 75-82 mph depending on the winds, I got 8.5 mpg. No lack of power issues.
Dealer Service Manager tells me I should expect that number to get up to the 12-14 mpg range towing once I hit 15-20k miles on the motor, based on the fleet trucks they service, so we'll see.
'01 7.3 got similar towing mileage in summertime with 3.73's. Winter mileage typically 2 mpg less. Empty mileage this winter (direct comparison to current 6.7 mpg conditions) was 12.5-13.5 on same roads, so 4-5 mpg lower. MPG's went up on 7.3L at 70k miles. Best summer combo driving empty on same roads I now drive the 6.7 was 15.5-16. Have not had 6.7 on summer fuel yet.
2011 F250 6.7L Crew Cab Lariat Long Bed 4x4
Ford Master Certified Sales Consultant
Last edited by bandit67; 02-26-2011 at 08:51 AM.