Behold the 2013 BMW 750i. The German automaker's flagship sedan bowed to a North American audience for the very first time at Pebble Beach, and while designers kept the big 7 largely unchanged outside, buyers can look forward to a slew of incremental improvements indoors. Under the hood, engineers rustled up an additional additional 45 horsepower and 30 pound-feet of torque from the 4.4-liter V8 in the 750i thanks to the addition of Valvetronic. The swap nudges the machine's final power figures to 445 horsepower and 480 lb-ft of twist, which help scoot the massive four-door to 60 mph in a scant 4.7 seconds. Hi-ho, Silver.

Even with the nudge in performance, BMW says it has managed to improve efficiency by around 25 percent due to the addition of a new eight-speed automatic transmission. Meanwhile, the 740i continues on with the same horsepower for 2013, but receives a 20-percent jump in efficiency thanks to its eight-speed gearbox.

Look for a new ECO PRO powertrain management system to bow on both the 740i and 750i as well. The system helps eek every last bit of available efficiency from the engine and transmission and includes a coast mode that allows the 7 Series to freewheel at speeds between 30 and 100 mph.