Sport puts everything on full attack and will allow the X5 xDrive45e to sprint to 60 mph in 5.
Unlike the i8, where the front wheels are electrically driven, the 40e has the electric motor located in the transmission, making 4x4 electric driving possible.
Also, batteries are heavy and can blunt the driving experience, and they create packaging issues — the 40e has a smaller, 500-litre, boot and only five seats rather than the option of seven.