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Hello John and welcome to the MOC gang. Congrats on the new Montana. You did not mention if you have a manual or auto tranny, the rearend ratio or how fast you tow. All of these will effect your mileage. All things considered, 10 MPG sounds reasonable. We get around 11.5 MPG with the Dodge/Cummins with 6 speed and 3.55 rearend towing a 3280RL (11,800#). I like to tow at about 65 MPH on interstates. The Cummins runs 1800 RPM in 6th gear at this speed. Good luck and happy camping!!!
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