Fuel economy for normal cars is not something new. A 22 year old design, the Avion, which achieved a worldrecord of 42 km to the litre in 1986, has recently improved that record to 48 km per liter (just over 2 liters per 100 km).
Streamlined body, light chassis, a 6 speed gearbox of a Smart and a small diesel engine is all that was needed.
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