Marketing is ALWAYS involved I think. Almost every bottle of shampoo says "Lather, Rinse, Repeat"...how many people actually repeat? You'd use twice the amount of 'poo, and not much difference in the cleaness of your hair!

Another point I forgot to mention in the original post is I was wondering about diluting the concentration of the additive. I fill up the tank and put in the juice, which is designed to treat no more than 21 gallons of gas. Then my tank is half empty and I fill up again. So now the additive is diluted even further. Does it do what it's intended to do, or does it only work while the gas in going through the system that the additive originally treated, and the rest gets "watered" down to where it does no good?

Does that make sense?

I read the term "splash mix" once in regards to full strength antifreeze and water. I understand the reasoning about putting the stuff in and letting the new gas splash mix it, but I'm wondering more if I'm getting my money's worth out of the additive, or whether it is only working for the half a tank before I refill.

Ideas?