Natral gas to my knowlegde is pretty much just cheaper and a lil cleaner. I dont know about diesel but gas or diesel can be made from gases under the ground,oil obvisouly,cow shit....literally, and vegtable oil. They have make your own diesel kits for your home where you refine old oil from like BK and grease traps into cleaner, cheaper diesel. Either way were heading towards fuel mutiny and were gunna b fred flinstoning our shit around town.