…[automotive diesel engines] seem to be more efficient and reliable than gasoline engines.
About 20% more efficient. If you look at L/100km or mpg you might say 40%, but diesel fuel has more energy by volume.
About 20% more efficient. If you look at L/100km or mpg you might say 40%, but diesel fuel has more energy by volume.
Extra maintenance is certainly present.
Or, in a pinch, two rocks