als o being as your motorhome is adiesel see where it does its final shift and if its close to 55mph and you have tha patience for that speed, you should be able to hold that speed rather well , with the torque from the diesel, we had a winne just like that except with a 440 gas, and it got about 6 miles to the gallon, but at 55 feathering the throttle it got about 9 -10 you should do better but its a huge improvement
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