Just saw this and it made me laugh: Disney Aims to Go Green
Apparently Disney has already begun to use recycled cooking oil to power it's trains in Disney World, but...
"Disneyland rides also use biodiesel instead of gasoline, though customers have inexplicably complained about the âfrench-fry smellâ emitted by the biodiesel when burned."
Sounds to me like just another way for Disney to make use of that 4D "smell-vertising" like it uses at the bakery on main street! 
Ride a few rides, and then mysteriously head over to grab some fries at Pecos Bills!!
