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Yes, it does benifit diesel engines. increase of 6 mpg is the proof. yes, they have argued it. but not one person has gone into detail to discuss it. plus i have the unit on 2 vehicles one that i drive and one that i work on, every day. the problem is everyone is buying these el cheapo plans off ebay. Now as for them not being any use to gas engines. i would take that bet any time.
and the square root of -1 = i
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