FWIW... ALL I can purchase (being in Canada) is Klotz octane booster and off the shelf crap. I plan on trying it in my 2002 SRX with DCS. I'm going to try 1/2 a tank of 87 octane, make the DCS light come on (no problem there!) and then add the octane boost to see if there is an improvement. If not I can simply top off with 91 octane and carry on. Wish I could get Torco and Race-Gas products to try as well...