[notfarnow]

Nice thing about biodiesel is it can come from many sources... waste cooking oil, fish oil from fishery operations, soy, canola etc.

It's a great way to make use of waste products, but from what I've read, growing plants for biodiesel isn't feasible from an economic or environmental perspective.

Downside to biodiesel is gelling in cold weather. Up here in Canada, you'd be hard-pressed to run more than b25 without modifying your fuel system to add some heat.