After Hours

Photos: Revving up on fast food

The engine of the Big Green Bus. To run on vegetable oil, the oil first has to be heated to 150 degrees Fahrenheit.

Michael Kanellos/CNET

By Bill Detwiler

Bill Detwiler is Editor in Chief of TechRepublic and the host of Cracking Open, CNET and TechRepublic's popular online show. Prior to joining TechRepublic in 2000, Bill was an IT manager, database administrator, and desktop support specialist in the ...