Wow, the fuel mileage really sucks based on my 1999 4WD 2500 Ram Quad cab with the 24 valve Cummins Diesel. I get 17.5 around the city and over 20 mpg on the highway unless I’m pushing the speed limit to around 80 mph and then it’s 18 to 20 mpg. I really expected to hear a big improvement over...
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