New heights for a hybrid.

For the striking design of its thermoplastic-and-aluminum body alone, the BMW i8 is a novel vehicle. But its ability to accommodate four occupants in such a low and shapely mid-engine design with a plug-in hybrid drivetrain elevates the i8’s status to groundbreaking.

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Behind the passenger compartment, which is made primarily of carbon-fiber-reinforced plastic and aluminum, is a twin-turbocharged, 1.5-liter inline 3-cylinder…