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seafoam works well but water is cheaper than $10 a bottle!
I have been seeing my mpg going down in my truck too. I think it is time for a rebuild considering I have no idea how many miles are on this truck and it works hard. I will check the compression when I do plugs this week.
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1991 F-250:
4.9L, Mazda 5 speed, 4.10 10.25" rear
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