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PIPE HITTER
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Not sure if it does, but I am curious as well.
 

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Stacey David (Gearz) did a TV show and found that it did improve the fuel mpgs. If they were not so expensive I would seriously think about one. The diff. in the fuel I save and the cost of the unit does not save me much money right now...
 

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Ole White
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I've seen those advertised before never talked to someone who has tryed one though.

Would be interested to know how much it really helps.
 
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