You ever been pulled over by the EPA? Not registered by the EPA means it isn't legal to manufacture and sell as vehicle fuel, not to use. I bet you couldn't pay a cop to cite you for running WVO.

Banana peels aren't registered as vehicle fuel either, but if you make a vehicle that burns banana peels, no one is going to stop you. If you start trying to sell BananaGas, though, that's when you get to talk to the gov'mint.

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RIP:
2011 E350 BlueTEC, Schwartz 81k (totaled by uninsured drunk driver)
1964 Unimog 404.1 (wrongfully towed by the city)
1994 E320, Brilliantsilber 208k (transmission shuffled off after sudden catastrophic fluid loss)
1982 300D, Silberblau under a blue repaint 256k (sold for parts)
1995 E320 Polarweiss, 131k (sold for parts)
1995 E300D Polarweiss, 287k (totaled by drunk driver)