The BMW X1 is offered in two different models for the U.S.: 28i and 35i The 28i is available as both 2-wheel drive and all-wheel drive, while the 35i is available only in all-wheel drive form. Both of the 28i models include a 240-horsepower, 2.0L TwinPower turbocharged 4-cylinder engine, while the 35i gets a 300-hp, 3.0L TwinPower turbocharged 6-cylinder. Both engines are mated to a 6-speed Steptronic automatic transmission. The X1's powertrain is configured to help maximize both performance and fuel economy and to aid efficiency an Auto Start/Stop system, which stops the engine when idling at stoplights and then smartly restarts it when the driver lifts off the brake, is standard on all X1 models. Brake energy regeneration and a selectable Eco Pro mode also helps reduce consumption and fuel economy ratings range up to 24 mpg city, 33 highway with the 4-cylinder. All-wheel-drive models include an electronically controlled multi-plate clutch system that can vary power smartly between front and rear wheels depending on the conditions. Hill Descent Control, for stability on steep slopes, is also included, as is Dynamic Stability Control. In exterior profile, the X1 looks like a somewhat scaled-down version of the up-sized X3 crossover, with the distinctive BMW quad round headlamps and kidney grille from the front with available xenon headlamps with LED light rings--and a more contoured look from the side, with flared wheel arches and turn signals integrated into the side mirrors. At the back, the X1 gets LED taillights. Inside, the X1 has space for five, with the rear seatback split 40/20/40 to expand cargo space when needed and still retain passenger space. The angle of the rear seatback is also adjustable, and thanks to that the cargo space can be varied from 12.7 to 17.0 cubic feet. Otherwise, all of the seatback sections fold forward to a flat cargo floor, and there's enough continuous length beside the seat to fit two snowboards or four pairs of skis, according to BMW. Standard equipment on all X1 models includes automatic climate control, heated power mirrors, an onboard computer, a leather-wrapped steering wheel, rain-sensing wipers, roof rails, fog lamps and a sound system that has HD Radio, and an auxiliary input. There's also full iPhone integration, as well as control for apps for streaming audio as well as the capability to show Facebook and Twitter posts. Major options include an M Sport Package, with larger 18-inch M double-spoke wheels and staggered-size performance tires, plus a Sport suspension, upgraded sport seats, an M Sport steering wheel, an aero kit, high-gloss roof rails and special Dark Aluminum or Light Fineline Wood trim, with an anthracite headliner. Packages include a Premium Package (panoramic moonroof, power memory front seats, universal garage-door opener, auto-dimming mirror; comfort-access keyless entry and Nevada leather); a Cold Weather Package (retractable headlight washers, heated front seats and a heated steering wheel); a Lighting Package (xenon headlamps, adaptive light control, ambiance lighting); and a Driver Assistance Package (rear view camera and parking distance control.) Harman/Kardon surround sound is a standalone option.