I've read and understand fully, biodiesel. I know today's diesels can and do run on biodiesel. However, to filter spent cooking oil through blue jeans and run it in today's H.O. diesel engine is suspect at best. Being that I've been a heavy equipment mechanic (diesel, hydraulic, gas, turbine, etc...) for 17+ years I have a, well lets say, okay understanding on how things work.
BTW, in my last post I said "Significant HP increase". Not that I don't believe HP would increase with the use of natural gas.
"Trust but verify."