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From Smart Car Specialists Limited:
Firstly lets get this into perspective. A 61bhp 599cc car is making 101.83 Bhp per litre which is very impressive, and the same specific power output as an E36 BMW M3. It is a little engine with only 2.7 litres of oil to cool and lubricate it. Most are driven flat out, full throttle everywhere, and often undergo poor maintenance. For example: sometimes only 3 spark plugs have been changed (they have 6: two per cylinder), they are given the the wrong oil and low grade fuel. There are many examples running high mileages and achieving 55+ mpg, but these have had a gentler life. Smart state in the handbook "Normal operation at constant speed 2000-3000rpm, brief periods of acceleration, e.g. when passing 3000-6300rpm."

Really?:|
 

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They are talking about the engine in the original (450) car back in 1998. It started out as a turbocharged 600cc engine. A couple years later it became a turbo 700cc engine. That engine indeed uses two valves per cylinder and two spark plugs per cylinder.

The Mitsubishi 1 litre engine didn't show up until 2007 in the 451 model.

100 bhp per litre might have been impressive back then, but a lot of non-turbo engines do that nowadays, including practically every performance motorcycle engine.
 
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