My preferred speed is 68 mph. The fuel mileage is not bad at that speed. The wind resistance towing a huge square box down the roadways takes a lot of fuel. My fuel mileage is between 8 to 10 miles per gallon. Towing with the weight I tow is around 26,000 +or-. Increase speed consumes more fuel. When I tow with just the Truck, equipped to travel, the mileage is between 16 to 18 more per gallon. Again thats at the speed limit. Good luck
Happy trails.
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