Grease Is the Word: Fill It Up With Fry Oil - New York Times: "ON a recent return trip from Massachusetts to my home in New Jersey, a distance of 160 miles, I burned a total of two cups of diesel fuel in my 2001 Volkswagen Jetta TDI.

Jim Norman, the author of this article, says that after more than 2,000 miles on veggie oil, there seem to be few disadvantages to the transformation. Since that would indicate fuel economy of more than 600 miles per gallon, something didn’t quite compute."