They’re describing the ignition equivalent of the “100 MPG carburetor.” It’s not even theoretically possible.

> combustion temperaure

OEMS fight to keep peak temperature down, because air is 80% nitrogen, and at high temperatures it forms compounds generically classified as “NOx”, which is a regulated pollutant, and very hard to deal with. Once closed-loop feedback became the norm for fuel systems, mixture-related emissions were largely eliminated, and any leftovers were dealt with by the catalytic convertor. Almost all of the emission-control devices and software in a modern automobile are concerned with minimizing NOx.

This is also where the “hydrogen fuel” nutters lose contact with reality and start babbling about “zero emissions.” Sure, if they were burning oxygen and hydrogen. But they’re burning air along with hydrogen, and hydrogen burns *hot*, aggravating the emission problem.