MEGA cab MPG
I just got back from a family trip to Florida and watched my milage the entire time wo were on the trip.
2007 Hemi Mega Cab, leveling kit, 35-12.50-17 Toyo MT, K&N drop in filter, Flowmaster muffler (no resonator), Diablosport Intune, and Undercover bed cover.
Normal highway driving 55 to 60 sometimes 65 it got 14 mpg, Interstate 70 to 75 sometimes 80 it got 13.5. Thats with the mpg boost programed. It didn't really feel like it lost any power from stock.
Not real sure if thats good or bad but seems ok for a huge truck.
Overall average fuel mileage = 18 mpg & I should be getting 20 now with the new main injection pump which is vastly superior to the stock one (long story about those).
Worst mileage = 15.6 mpg, in Colorado, pulling a tandem-axle covered trailer loaded up with bikes, tools, etc. that probably weighed somewhere around 6000-7000 lbs.
Best mileage before the new injection pump = 19.3, on the interstate with a tonneau over the bed & just a couple toolboxes inside -- cruise control & A/C on, 65 mph.
Now you know one of the reasons I got a diesel ;-)
Had to add that a friend of mine has a '97 Dodge 3500 Dually 6x6 diesel (12-valve, mechanically controlled) & his has the standard 3.57 gears & highway tires. His average fuel mileage has been about 21 mpg. He owns a vending machine company & carries loaded Pepsi machines, etc. in the back from time to time & sometimes he's got a camper shell on it with not much of a load inside. The bigger tires & lower gear ratio on my truck is what drops the mileage compared to his.
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