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An aerodynamic vehicle with a small diesel engine and long gearbox has been possible for decades now.
A 1999 VW Lupo 3L can beat 3,0 L/100 km (78 mpg) pretty easy with its 1.2 TDi engine.
If you swapped a Smart Roadster with the Smart ForTwo 0.8 CDI engine, you'd have an absurdly fuel efficent as well as fun car (if it wasn't for that god awfull gearbox).
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