Did not say and do not think it is a bad idea. I think that waste vegetable oil is a great thing to use as fuel. Why wouldn't it be? Instead of pulling something out of the Earth to burn, WVO burns something that might be dumped onto the Earth as a pollutant.

I'd like to find a small engine (about 5 hp) that would run on it and was not a big behemoth like a listeroid. A good webpage about running stuff on vegetable oil is: http://www.me.columbia.edu/me3410/spring06/group01/.