[Govindae]

Yes, but stratified charge combustion produces significantly more NOx in cylinder because of the excess oxygen.

[skgoa]

Which is exactly what most gasoline engines do, too.

[Govindae]

Most gasoline engines are homegenous charge, and run within a few percent of the stoichiometric air fuel ratio. Diesels will run at 6x the stoichiometric ideal amount of air.