42% efficient gasoline engine

[user removed]

Green Car Congress: Mahle gasoline-only pre-chamber jet ignition combustion system yields diesel-like thermal efficiency of 42.8%; 45% achievable with engine upgrade

regards
Mech

[gone-ot]

...looks like an "updated" version of Honda's earlier Compound Vortex Controlled Combustion (CVCC), where the "updating" is the replacement of the dual venturi carburetor with duel fuel injector(s).