** ADV SEPT 4 ** Some of Colette Brooks vintage automobiles displaying license plates reflecting their use of biodiesel fuel are shown at her home in Malibu, Calif., Thursday, April 19, 2007. With her earth-friendly car finder service, Biobling, Brooks is one of many entrepreneurs turning gas guzzlers into green machines as the interest in alternative fuel steadily spreads nationwide. (AP Photo/Reed Saxon)