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Ocnorb, what rear end ratio did you have? And what are you running now? It seems like rpm is the big issue. I had a '93 7.3 IDI crew cab dually with a 4.10 and had to really work to get 14mpg. Meanwhile, my '02 7.3 Powerstroke with 3.73 rear end and single rear wheels gets 19 to 20mpg with 345,000 miles on it!
By the way, I have an '85 F-350 I'm about to part out plus an '85 E-350 that I want to fix up. Keep 'em and drive 'em forever!
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