I've made it and used it for years. Simple. Easy. Cheap. Smells much better than petrodiesel, lubricates your engine, runs quieter, reduces emissions, is carbon neutral or doesn't contribute to global warming, and it doesn't require wars in the middle east or drilling in prime caribou habitat! Good recipe at
http://www.journeytoforever.com -- sounds complicated but it isn't. Does require the handling of methanol and lye, so use extreme caution and keep your bioshine shed away from your kids and pets!