I understand fully if folks don't believe a 20 percent gain. I find it hard to believe as well, but it doesn't matter. Like you said to make accurate comparisons you need similar conditions - you really need a lab control to tell specific gains. however, if the average joe is seeing ANY gains - hell, even 5 percent- this product is a gold mine. even if folks save .50 every time they fill up - if it makes sense and they can see ANY savings they will use it. that is what I was trying to explain to that other poster, this product does not need to change the world to be highly profitable - even very modest improvements will pay off as long as gas prices remain so high.
Behold the fool saith, "Put not all thine eggs in the one basket"--which is but a manner of saying, "Scatter your money and your attention;" but the wise man saith, "Put all your eggs in the one basket and--WATCH THAT BASKET."
- Mark Twain