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I have a 1989 f-250 with a 7.3L diesel. No turbo. I never get any black smoke no matter how hard I pull or throttle it. I am only getting 10-12 mpg. I was told this eg. should run around 3000rpm. I don't thank that is right. How can improve this fuel mileage? I have already tried fuel additives. And where is the horsepower (rpm) on this engines.