http://www.eere.energy.gov/afdc/altfuel/p-series.html Pentane plus, sounds cool. Some what like gas but with out all the longer, bigger hydrocarbons. This "new" gasoline sub is kind of like how gas was when it all was 100% distilled from crude oil. Back in the days long before leaded gas and Cracked gasoline, distilled gas would off gas these compounds mainly propane, pentane and others. That is how propane was discovered. Now it's back. Years ago when I herd of this old school gasoline it made me think, could I some how make gasoline hold propane? At least some propane will mix with gas I know that. Maybe I could mix propane with gasoline and they could make one liquid and burned as such.