>> larry: you're writing all the time. >> it's -- i could if i wanted to. i could, you know, sit down and write something right now, you know, who knows if it would be any good or not but it would be something. i think any songwriter, if you're a pro, you should be able to write on the spot. >> larry: you often perform with your youngest sons. are they on this tour with you? >> they're going to be. they're starting out with me. lucas is playing an opening for me on this next tour that i start. >> larry: you must be very proud of that. >> that's exciting. >> larry: tell me about biowillie. what is that? >> the name of a product, biodiesel that we developed, made out of vegetable oil from restaurants and we use it to fuel the trucks. >> larry: a mercedes runs on that, he gets it from restaurants. >> yeah. absolutely. and it's -- the new thing. >> larry: you're riding on grease. >> vegetable oil, yeah. >> larry: have you it on your