I drive a 2003 Dodge Heavy Duty with the Cummins. I was very discouraged with mileage for the first 14,000 miles. Recently I made a 2700 mile trip without the Montana and it started with 16 miles to the gallon driving into a 35-40 miles per hour wind. After this I did not get less than 20 miles to the gallon. It runs better and the mileage has improved since I got 13 mpg when it was new. Towing I get 12 to 13 miles to the gallon. I am happy with the truck but I am trading it for a new Ford 3500 SRW with the Powerstroke because of the extra room in the back seat, the great automatic transmission, and the integrated brake controller. It should be here right after the first of the year. Happy travels
Dwaine Wagner
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