Quote:

Years ago (early 1980's) guys were installing water injection systems in their cars and reporting a 10% - 20% increase in gas mileage.



What those systems did was use the combustion chamber heat to convert water to steam. That would utilize some of the wasted heat energy. Saw a story on TV about a 6 cycle engine. After the exhaust stroke, water is injected into the combustion chamber to get a steam powered stroke.