I found this incredible vehicle on ebay. It runs on waste vegetable oil. Very inspiring.

Elbee is the world’s largest, and most luxurious Waste Vegetable Oil (WVO)
powered vehicle. What’s more, Elbee is designed to be a completely self sustaining, American Freedom Machine.
With a built in WVO filtration / dewatering system and WVO powered electric generator, Elbee takes on free, clean fuel indefinitely, while traveling.

Link to ebay auction