BMW's i3 is built from the ground up, not a conversion. It is a rear-wheel-drive, four-seat hatchback with a pair of rear-hinged back doors. The electric drive produces the equivalent of 170 hp. An optional two-cylinder engine acts as a generator to extend the range beyond the 72 miles, to about 150 total. Charge times are 4.5 hours on 240-volt circuit, through the 7.4-kW onboard charger. The car uses an aluminum frame and carbon fiber structure to reduce weight. Despite its tall stance the car is very agile. It feels quick and easy to maneuver. The pronounced deceleration when lifting off the gas pedal takes some getting used to.