Called the ' Physics Bus', it will carry a total of 400 gallons of used oil on its journey which had been strained to remove food stuff like donut crumbs and taco bits. The fuel, according to teacher and leader Erik Herman, makes for interesting smells during the ride. "If it was used for french fries, it smells like french fries," he says. "If it was used for doughnuts, it smells like doughnuts. If it was used for Mexican food, it smells like that."
The Physics bus will restock its fuel in New Mexico and, later, in Ohio.
[Source: Tucson Citizen]