[H_Cubed]

Hmm, after reading up on Calcium Sulfonate (the main ingredient of CA40), i'm gonna pass on this one. Calcium Sulfonate has been used for many years in motor and lubricating oils as a detergent and thickening agent. You would think that if this was some breaking new product, gasoline would already contain it.

There are a number of questions on how this stuff works exactly, from what I read on their website it appears it works on the exhaust system and the O2 sensor, to fool the PCM into running the fuel mixture lean, producing higher engine temperatures resulting in some marginally better fuel economy. If thats the case, small quantities Acetone could do the same thing at ratios 1 oz. per 15-20 gallons (and be waaay cheaper!). However running your engine very lean (therefore hotter) might be detrimental over a long period of time. Not only is a lean condition potentially damaging, it can very quickly heat up your catalytic converter, destroying it or worse still cause a fire under it.