Long before EVs dominated headlines—and long before Dieselgate tarnished the oil-burner—diesel was championed as the clean, high-torque fuel of the future. Automakers pushed the envelope, even combining diesel efficiency with lightweight, mid-engine sports car dynamics. The most audacious proof was the Opel Eco Speedster: a featherweight, Lotus-derived concept that smashed 17 international performance and efficiency records in a single day before fading into automotive lore.
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