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I have a buddy who is has a "hot-shot" delivery service. He puts 150K-200K miles per year. He has only Fords. He had a King Ranch F-250 that he put 300K on and now he has a 2006 F-350 dually that has about 40K on it now. He told me yesterday that he puts 1 quart of tranny fluid per tank of fuel. He told me it bumps his milage up about 1-2 mpg.
Old school trick for cleaning injectors. I had heard, its not good for todats new an improved. No facts on the new ones. Truckers use to fill the filters with gas when changing them, thought it would burn hotter an clean tips. Never saw any damage, but again no facts if any good.
I drive 18 wheeler, gets 5-5.5mpg, I use howes treatment, gets a proven .2-.5mpg increase with a notice in power. Buddy at work tried this on his 75,000 mile 7.3 and he loves it, power and mileage increase.
My buddy at work with the 7.3 uesd my Howes, now is buying his own! Said it did increase power, fuel mileage was never taken, other than he's one of them guys that say he got so many days on it. He did say it was better.