Volkswagen’s XL1 (version 1), presented in 2013, was the world’s most economical production diesel plug-in hybrid car, with fuel consumption of only 0.9 l/100 km (over 261 miles per U.S. gallon). It had a 25-kW (48 PS) two-cylinder TDI engine and a 20-kW (27 PS) electric motor, a seven-speed dual-clutch gearbox, and a lithium-ion battery. The two-seater…
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