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I was doing some number crunching with 4 cylinder turbo diesels a year ago and figured on 40+ mpg in the truck. I was using the factory gal/hr ratings for half load and full load, at full rpm. At full load doing 60 mph, it would get about 30 mpg and at half load it would be around 50 mpg. I figured on 40 as the average.
I was looking at deutz, cummins, cat, and some others at the time. Most of the 4 cylinders seem to use about 2.5 gallons per hour at full load/max rpm. Not bad for a truck......
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1991 F-250:
4.9L, Mazda 5 speed, 4.10 10.25" rear
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