This link said it was not BS, I am confused?

But even if it wasn't, acethon is not that cheap at that amount for each tank refill.

Regardless, I have been using STP's Fuel Injector cleaner (around $1.77 @ Wal-Mart/Target) every other to every third fill up for about a year now and I can honestly say there is a noticable mileage improvement as well as increase in power. Frequent and stedy use of this type of chemical (made from jet fuel) not only keeps fuel lines/injector cleaner but also removes alcohol from fuel, making the fuel more efficient thus resulting in improved mileage and increase in horsepower.

I am guessing at least 5% in power and about 2-3 miles per gallon. So spending about $4 a month on this chemical saves me at least $10-$20 in gas per month and also gives my truck more power by using fuel more efficiently.

No BS!

~TL