My car, a cool innovation

My grandad has a friend who is looking to sell a 95 jetta with a grease kit on it. He told me this and I had no idea what it was. So we went out to look at it and it looked like a box on wheels, I mean i really did not like it, but since they were friends I had to pretend like it was in the runned to be my car. So we took it out for a drive and he explained to me what the grease kit is and does. Apparently this grease kit can use fry oil from like little "mom and pop" shops and get up to 50 miles to the gallon by using it, as long as the engine is hot enought to burn the fuel. Also it ran on diesel fuel and got 50 miles to the gallon on that as well. So in the summer I could go to China in this car without having to fill up, but it was one of the most unasthetically pleasing cars I have ever seen, so in the end I am going to wait til thursday and look at other cars. So yet again I have to wait to get a car.