Yeah we've challenged these folks and several others to a real scientific test criteria through Moabjeeper Magazine, but everytime they shy away. Many go into the it's "proprietary technology" or "our manufacturing technique would be compormised" routines. Fact is that any "technology" that is said to get you that big a gain in HP or fuel mileage generally BS, like crystals and weight loss products. Theres physics and chemistry to this and if someone really did crack the code, they'd be making billions and everyone would have one. Hell Id bet that GM would use it to beat the Japanese and Koreans with a super high mileage car. Yeti, Aliens and bolt on mileage improvers are all in the same class of myth.