I tried this over a 6 month period about 3 years ago. There was no change what so ever to noise,power or fuel economy. I think you would be better off, & cheaper to just use chemtech every now & then, like I do. Maybe it is the quality of fuel (brand) that some people use & may be the 2T helps with lower quality fuels. I only run BP so maybe why It didn't work for me. Can't help think it's just the placebo effect taking place.