I don't believe I said it was a dumb idea, but that it wouldn't scale. Repurposing recycled or waste oils for vehicle combustion is a fine idea if you're properly managing the particulates emissions.

> Corn & soybeans are global commodities, so to suggest it competes with food is not an accurate reflection of how food is priced.

Food goes to whomever will pay the most for it, same as fuel. If there is greater demand for it as a fuel than those at the bottom affordability rungs for crops, there are no regulatory mechanisms to ensure those who need food get it instead of those who would burn it in vehicles.