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theres no real reason to become too negative towards this person, if he honestly has a mileage improvement then there must be a reason.
what strikes me is that you are not hypermiling for better FE, wich imo would be the first logic thing to do. it also means that the slightest un-noticable change in driving style can result in significant FE improvement.
paying 100's? of dollars for a controversial tool wich in the FE world is seen a scam is a rather strange choice. while hypermiling is not only free, but it saves you money at the verry first tank with a result that is proven.
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