Hah, that water to gas converter is the biggest bunch of bull I've seen in a long time. Hilarious!
One thing they forgot to mention that people are starting to believe: adding acetone/ethanol to increase your fuel economy. Gah!!! Stupidest idea ever. Those compounds aren't as stable as heptane and octane and will both corrode parts of your engine slowly over time and screw up your engine if the amounts are too high.