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A friend of mine tried this additive out and now swears by the MPG increase he is getting. About 4 mpg. Anyone else tried this stuff?
 

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A 20% increase in fuel economy sounds a bit far fetched. With claims like that, I'd wonder he'd been drinking it rather than adding it to his tank.
 

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A friend of mine tried this additive out and now swears by the MPG increase he is getting. About 4 mpg. Anyone else tried this stuff?
I believe B767capt has some input on this or one of their other additives. Let's just say "Pentosin Guniea Pig"...
 
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