I saw a lady drive it in San Francisco. It had CA plates. A sticker on the back said "Cleaner Burning Renewable Bio-Diesel." I was behind that car for maybe 2 miles in stop-and-go downdown traffic. The exhaust smelled only mildly of fries -- much less than the bio-diesel-powered cars I've smelled in Europe during the past 15 years. I thought cars with the TDI engine couldn't be registered in CA?