hc. Good read on that..
Watched a show about a guy collecting used cooking oil from restaurants.
Back too his barn. Had a small set up too make a diesel?? product.
Samll diesel truck, ran fine.
Thailand Coils.. Propane bottles in the back of the small pick-ups..
My buddy says..
Fuel gets too high, they switch too propane..
I have no idea how it works, but they were truckin.