This could be a big environmental and economic benefit. To wit: "SFPUC official Lewis Harrison stated that at least 1 million gallons of biodiesel could be produced from left-over restaurant grease, which is "more than enough" to run the city's entire bus fleet on B20. Since WVO is a waste stream, offsetting petro-diesel usage with WVO biodiesel is particularly advantageous: the use of 1 million gallons of WVO-biodiesel would offset 19,600,000 lbs (9,800 tons) of carbon dioxide emissions each year. It also has significant economic and public health benefits: municipal biodiesel production should beat the $4/gallon price of fuel in San Francisco, and B20 biodiesel blends cut diesel soot emissions by 20-40%."
This quote was taken from an article on Green Options. Click here to check it out.
[Source: Green Options]