>> how's it looking, good looking? >> i remember when a dime bag cost a dime, you know what i mean? >> larry: back with our remaining moments with willie nelson. tell me about bio willie. what is that? >> bio willie is the name of a product, biodiesel, that we developed. it's made out of vegetable oil from restaurants. and we use it to fuel the trucks. >> larry: cal, cal fussman, who wrote my book with me, has a mercedes that runs on that. >> yeah. >> larry: he gets it from restaurants. >> absolutely. it's the new thing. >> larry: you're riding on grease. >> vegetable oil. yeah. >> larry: you have it on the bus? >> have it on the bus also. >> larry: you seem to have lived pretty much by your own rules. do you have any major regret? as sinatra would say, regrets, i've had a few, but then again,