I've got a couple of friends who've made the switch to vegetable oil for their cars and they love it. But really, I think the best part of these biofuels is the smell of the exhaust. I love driving behind them because it smells like french fries! I really think some clever fast food joint ought to capitalize on that and start paying folks to drive around the city in cars emblazoned with their company logo and dispensing that wonderful smell out their exhaust pipe. Seriously. I'm getting hungry right now just thinking about it.