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I drive a 03 ram 2500 diesel, 6 speed. 35x12.5 17 mud tires and 3.73 gears. Best I ever got was 600 miles at 28 mpg with a 12 foot noat sticking out the back. I can get 40+ mpg upto 40 mph, by 50 it's just over 30, at 55 it starts dropping and it's all downhill from there, gets to be 17mpg by 70. Really not aerodynamic. When looking at the gallon per hour display,, I see a sudden increase at about 1700 rpm - cruising rpm- when the turbo starts spooling. If I could get some lightweight street tires, larger diameter, I might gain a few more mpg. Forgot where I was going, it's late
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