To create the i4, BMW essentially replaced the gasoline engine in the 4 Series Gran Coupe with an electric motor—or motors, in the case of the dual-motor M50 model we tested. During this transformation, the automaker managed to retain the driving experience that BMW buyers have come to expect: smooth power, quick acceleration, and taut handling. Comfortable front seats, a hushed interior, and a finely-furnished cabin also helped the i4 achieve an impressively high road-test score.