Originally Posted by
cooperplace
any diesel car engine!
Nope. Not even close.
A well-managed Lyc/Conti should be good for 235/240g/kWh (0.39lb/hp.h) in the cruise and most modern auto diesels are lucky to be any better than 210-220-ish
Where the Lyc/Conti loses is that they require the largely-uneducated to manage the mixture knob.