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Inefficient in trucks, yes. The notoriously thirsty Detroit diesels of yore basically converted fuel into noise. Obviously their fuel injection systems were more crude than what is possible now. Maybe it was the duty cycle of the average truck (not a steady load at rated speed) that led to the demise of the screamin' demon.
I am well aware of the effects of modern technology coupled with the lowly two stroke. Piwoslaw: the Peugeot scooter you mention is a gasoline engine, not a diesel. With direct injection, it blows equivalent 4-stroke scooter engines away in power, economy and emissions.
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