What’s next? Cop cars that run on powdered sugar?

From an
article in the NY Times: “He will then start the vehicle on regular
diesel, and after a few minutes, when the vegetable oil becomes more viscous
in the heater, a manual switch will direct it to the diesel engine. From
there, the only detectable difference will be the faint odor of French
fries, and a noticeable lack of diesel stench.” (Thanks for the link John)