Ok I will do the math for EnviroMax Plus:
Their recipe is 1 oz/10 gal = 1 oz/1280 oz
Our gas tank capacity is 23 gal = 2944 oz
Therefore the amount of magic elixir needed for our tank is:
2.3 ounces into 23 gallons
The volume percent of magic elixir becomes:
2.3/2944 * 100 = 0.078125 %
WOW
0.078125 percent of snake oil is all it takes to increase hp AND save in fuel economy. If true, then these people would certainly be a candidate for the Nobel Prize.