With the fuel prices being so high, i was thinking about experimenting with other fuels, WVO being the main one. Since i always have a lot of used engine oil from the vehicles i service, i was thinking about burning it in my diesels. The blend would be something like 5 to 10% oil. The only concern is that my cars have catalytic converters. I'm not sure how different is a catalytic converter in a diesel compared to a gas car... Should i stick to WVO only as a alternative fuel?