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About 1984 was the first I saw the 6.9 diesel engine in the ford pickups. From there they went to the 7.3. These were naturally aspirated (means they suck the air into the combustiion chambers) After individual companies who manufactured turbocharger systems to install on the ford pickups, the factory felt they were missing out on something. They (ford) then went to the factory turbo systems, but still not producing the power the aftermarket systems were producing. They did this because they felt John Q Public didnt know how to maintain a turocharged engine - allowing it to warm up a little bit before producing power and also letting it cool down after a hard run. The coolind down would prevent the turbo bearing from "coking" or forming a burnt oil residue and taking out the bearings.
And now we have the power stroke and the rest is history.
I cant wait for the turbine engine to come back. Watch out George Jetson.
You will see normally around 12+ even in the city, I do a mix of city driving and 70+ on the highway. I am heavy on the go pedal and I get 12-13, now if I take it easy I can increase that to around 15. You have to understand that the Enterprise tips the scales at 8k lbs, and is a dually, so if you get a lighter truck with single rear wheels you will be better off in the mpg dept.