You may spot business owner Yale Wong cruising the streets in his shiny black Mercedes Benz. However, it is what’s inside his luxury sedan that grabs the most attention. Wong fuels his car with biodiesel made from food grease and vegetable oil — yes, the same grease used to deep fry your fish ‘n’ chips, chicken tenders, and side order of fries. Some consider it to be a promising alternative to petroleum fuel and a better option than soy-based biodiesel, which has recently been criticized for not being “green” enough.