Comment Re:NOx and emissions? (Score 2, Informative) 379
NOx emissions would definitely be an issue if the operation of injection system depends on having a "lean mixture", as the article half-implies. Emission requirements are what killed the 80s concept of a "lean burn" engine. The three-way catalyst required to meet most western emissions regulations, requires a stoichiometric engine, i.e. one that takes in just enough air to oxidise all the fuel, but no more.