"Greaseball Challenge is a charity biofuel car rally from the US to Central America on a shoestring budget. To preserve this ethos, there are a few simple rules:

1.) Teams must find a vehicle on a shoestring budget.
2.) Teams are on their own – unsupported for the duration of the rally!
3.) Vehicles are powered using alternative fuels – biodiesel, vegetable oil, waste grease, or any renewable fuel source.
4.) All vehicles are donated in the destination countries to benefit local environmental projects.
5.) Greaseballers will source their fuel from a number of greasestops on the road: biodiesel producers, diners, fast-food outlets, supermarkets, factories, and farms. The possibilities are endless, and rather daunting. It’s a challenge."

http://www.greaseballrally.com/chal...