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With my scanguage, 4.11 rear and 6.0 I have figured that around 62 mph is best speed and that is just about 2000rpm. I don't start getting "bad milage" until I am going over 69mph. While towing down to disney I was going about 68mph towing 6k and averaged about 11.8 mpg. Around town and commuting I get about 14.5mpg. I use either DieselKleen or 2 cycle oil and rotate usage.
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2005  E-350 Super Duty Chateau 6.0 PSD (Wiring harness relaced (under warrantee), FICM replaced, Alternator, DEKA Batteries)
1999 Chevy Express Mark III
2002 Forest River Shamrock 25BH
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