This is probably like just about ANY non-prescription product out there today. The only reason that they continue to sell is the placebo effect-if you spend money to buy the pill, you probably also inadvertantly try harder on some other aspect of the problem such that it APPEARS to give a benefit.

If you use this, you are likely to see a bit of a fuel economy increase, but it will be due more to you hypermiling the S2000. I can say that this will most likely suck the fun out of the car-do magnets attract fun?