

Like I said, follow the instructions. That includes removing impurities if you’re working with used cooking oil. If it’s unused then that simplifies things.
Doing it at scale may not be economical because of taxes as well as the fact you either need to buy expensive vegetable oil or collect large amounts of used oil from disparate places. For personal use the taxes are avoided and you may be able to get sufficient used oil from a couple of restaurants or neighbors.














My understanding is that the vast majority of US subsidies in this area are for production rather than consumption subsidies aimed at reducing the price (only $44 billion out of $760 billion). The US is also on the lower end of fossil fuel subsidies compared to other countries at $28.16 per person in 2021, which seems considerably less than how much each person would have paid in fuel taxes that year.