The classic cars from the ‘70s and ‘80s you want to save from extinction the most
4: Smart Fortwo – 86g/km CO2
The smart fortwo has a large selection of models boasting sub-100g/km CO2 emissions, including the UK's most fuel efficient car, the smart fortwo diesel.
This averages an astonishing 85.6mpg and emits 86g/km CO2, although the practicality constraints of two seats mean it is not the UK's favourite green car.
Average mpg: 85.6
Find a used Smart Fortwo cdi on Auto Trader
Long-term test: Smart Fortwo cdi
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