A recurring repsonse in this forum is don't believe everything you read/hear, and this applies to everyday life as well! Gas additives, oil additives, air filters, octane, etc. have all been discussed at length in here and boil down to, for the most part, advertising companies telling you what you want to hear (more power or less engine wear). The people that respond in here have been down more roads than most of us ever will and see right through most of the crap out there - hats off to you as there's nothing like an informed consumer!