The 6hp Listeroid engine, here built into a very nice genset. This engine runs great on everything from veggie to motor oil and tranny fluid! The builder of this Lister-Genset claims that it burns only 0.3 gallon per hour @8,000 watts! If this is true, it's fantastic! Imagine growing an acre of your own high-oil-yeilding sunflower crop to run it for when the sun isn't shining, or when the wind isn't blowing.