Fuel Mileage 2018 F250 diesel (Not towing)
I thought I would post my fuel mileage for general reference.
I have a 2018 F250 extended cab, short bed, 4x4 diesel with a camper shell. This was NOT towing the Airstream. From Tulsa to Colorado Springs to Casper, WY, to Yellowstone to Jackson, WY, to Salt Lake City to Las Vegas to Flagstaff and Grand Canyon and back to Tulsa. Driving 3 mph over the speed limit which for the most part was 73 to 78 mph. All combined driving was 3,628 miles and 199.1 gallons of fuel for 18.22 mpg. The worst we got was 16.2 mpg against a strong head wind and the best we got was 20.7 with no headwind. Going uphill or downhill, mountains versus flat, didn't seem to affect mileage as much as the wind.
Hope this helps someone. I haven't pulled the Airstream any significant distance yet to know the towing mpg.
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