2005 Dodge Ram Cummins 2500 Power Wagon 4x4 Turbo Diesel. ... A stock diesel cooling fan and clutch, radiator, intercooler, ... and he's getting an impressive 18 mpg in the city and 21 mpg on the ...

According to Cummins, the engine is a 78-liter, turbo-diesel V-18. We can't emphasize the "turbo" prefix enough -- after all, the engine has no less than 12 turbochargers bolted onto it.