They are good engines, as compared to what GM had in pickups at the same time. Forged steel crank, heavy block, gear drive cam, etc. I've had several and never had glow plug problems. When Ford switched over to the German-made Beru plugs - the system became very reliable.
But fuel milage? Not so hot, in part because it's an indirect-injected engine. My 1985 F250 4WD with no overdrive and 4.10 axles gets a best of 13 MPG empty, going down the highway. My 94 IDI has a turbo 7.3 which is just a 6.9 with slightly bigger pistons. It is also 4WD but has overdrive and 4.10 axles. Highway mileage empty in NY is 14-15 MPG. In the flatlands of Michgian I've gotten almost 17 MPG.
27 foot motorhome with no overdrive (maybe got a C6?) is going to get 8-9 MPG if you're very lucky. Some came with GM 6.2s and they got around 7 MPG and didn't last long. Many got replaced with Isuzu or Cummins 3.9 liter engines.
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Today's Featured Article - Talk of the Town: Winterizing Engines - To Drain or Not to Drain? - by Russ Berry. What is this strange attraction I have to equipment and machinery? How did I get this way? I came from the suburbs and own a small horse farm in rural Loudoun County, Virginia. You can call me a "weekend farmer." The local farmers do. Does it bother me? No. I am just happy to have their friendship. At least the word "farmer" is in my title. But what is the attraction? How can I explain the sensation and exhilaration I feel when I turn the key and hear the engine come to life (most
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