keywords: fries oil popcorn bus vegetable
text: Students' Bus Powered by Vegetable Oil (AP) AP - It's not unusual for the students traveling cross-country aboard an old school bus to get a craving for fried chicken. Or popcorn. Or french fries. That's because their vehicle is powered by vegetable oil, and the used oil they put in their tank can carry the telltale odors of the restaurant it came from.