I have a 1983 Diesel Oldsmobile — you know, one of those huge boats
— last time I did a MPG calculation I was getting just under 40 MPG (most of it was highway)… but, remember, this is one of those huge cars and 30 years old. In my experience Diesels break down less than gasoline engines, too.
“WOW! One of those Olds is still alive? Amazing.
So you got that one 5.7 that the time bomb did not go off in.
The Olds 5.7 diesel (converted from a gas engine) was one of the reasons the diesel engine vanished from US built cars for as long as it did.