I have a 2004 endura 6340 and tow a 3/4 crew cab 4x4 diesel P/U and when fully loaded and towing near 10,000 lbs I drive at 58 mph. I get 5.9 mpg, I went on a trip this fall not towing and travelled fairly light I got 11.9 mpg. I have the gas unit.. it's for sale since I am looking at the tow hauler endura
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