I used mostly waste vegetable oil from restaurants and biodiesel made from vegetable oil and methanol, both of which are renewable fuels. Vegetable oil is a cleaner-burning, renewable, and economical alternative to diesel fuel as we are running out of fossil fuels. I drove a VW Golf and made some modifications to it to be able to run on vegetable oil fuel. I experienced some mechanical problems along my journey but found community with others on a similar road to Detroit through a support website.