Review: 2015 BMW X4 xDrive28i

On a winding back road, the $54,550 28i version of the X4 will match a twin turbo Porsche Macan, move for move, while costing you $33,000 less. What’s the secret recipe here that BMW used to transform the practical but ponderous X3 platform into an Olympic grade decathlete? It’s the X4′s brilliant front mid-engine configuration.