LoveCraft Bio-Fuels, based in LA, converts diesel cars to run on waste vegetable oil (WVO), straight vegetable oil (SVO), or bio-diesel. LoveCraft is founded by Brian Friedman, who invented and patented the devices used in the conversion. What makes a LoveCraft conversion so unique is that it uses the existing fuel tank; most conversions require a second tank to be installed for the biofuel. LoveCraft has converted about 900 cars, and continues to convert about 4-5 a day. While they focus on older Mercedes, they've also done VW Bettles, Ford PowerStrokes, and probably a lot more. After the conversion the cars can run on WVO from restaurants. This works out well for the restaurants too, as they'd normally pay about $1/gallon to have the waste cooking oil hauled away. In fact, Friedman reports that now many of his customers are restaurant owners. LoveCraft has(?) recently opened a biofuel refueling station, for those who don't want to deal with collecting and filtering WVO themselves.