Driven in prototype guise by Autocar at BMW’s Miramas test track in France last year, the hybrid-powered X5 runs a longitudinally mounted turbocharged 2.0-litre petrol engine. The four-cylinder unit has outputs of 242bhp and 258lb ft of torque and works in combination with an electric motor that's sited in the forward section of its standard eight-speed automatic gearbox and produces 111bhp and 184lb ft.
Altogether, the X5 xDrive40e possesses a combined system output of 309bhp and 332lb ft. This gives it 55bhp more but 81lb ft less than the popular turbocharged 3.0-litre six-cylinder diesel X5 xDrive30d.
The X5 xDrive40e’s electric motor draws energy from a 9kWh lithium ion battery consisting of 96 individual cells. The mounting of the battery at the rear reduces boot space by 150 litres over existing petrol and diesel-powered third-generation X5 models, with BMW claiming a nominal 500 litres with the split/folding rear seats in place. The recharging time is put at 2hr 48min on an optional 3.5kW wallbox that operates at 16 amperes and 230V.