The 4.7-metre-long BMW i8, shown here at the Frankfurt motor show, features unusual construction methods, using a carbonfibre-reinforced plastic (CFRP) bodyshell sitting on a welded aluminium chassis. BMW claims the i8 can hit 62mph from rest in just 4.4sec with both the engine and electric motor engaged. Top speed — achieved by the petrol engine alone — is 155mph. BMW says this performance is partly thanks to the i8's relatively low weight of 1490kg and an aerodynamic bodyshell, which has a drag coefficient of 0.26.
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