In the south, we fry EVERYTHING

Southeast Alabama City Makes History With Alternative Fuel

Eufaula city officials made their first batch of bio-diesel and they're ready to start filling up school buses this fall. Eufaula is believed to be the only city in the country with its own alternative fuel.
I'm not sure how practical this is. On a small scale it might work, but anything larger than a few gallons and you're going to run into problems. Buying, transporting, filtering, distributing, all are a detriment to energy efficiency. It's still and interesting exercise.