I know its being used to fuel big trucks. They have to start the engines on regular diesel and run them until they get hot, then they switch to the cooking oil. There are people in Minnesota that use the recycled stuff from restaurant's, they filter it and then burn it. It basically becomes bio diesel at that point which is normally made from soybeans. I have a friend that flies lots of diesel model engines and the model diesel fuel is nothing at all like real diesel fuel. I think its mostly ether because as soon as he cracks the cover on the can you can smell it. I think he uses kerosene which is more along the lines of #1 diesel or jet fuel where the cooking oil is probably more like #6 heating oil. I am sure if your a tinkerer you could do it and it would be a neat experiment but probably not to practical. Jeff