Genius....dammit manOh heck, tell them it's a turbine engine. When they give you the look that tells you that they're too stupid to know what a turbine engine is, get technical and tell them it's a surplus turboshaft engine from a military helicopter and it's so versatile that it'll run on anything - jet fuel, gasoline, diesel, and peanut oil. "I run the high octane peanut oil/corn oil blend because it's renewable!"