The 2011 BMW 1 Series is a 2-door, 4-passenger luxury sports coupe, or luxury convertible, available in 4 trims, ranging from the 128i Coupe to the 135i Convertible.The 2011 BMW 1 Series is equipped with a standard 3.0-liter, I6, 230-horsepower engine that achieves 18-mpg in the city and 28-mpg on the highway. A 6-speed manual transmission with overdrive is standard, and a 6-speed automatic transmission with overdrive is optional. The 135i Convertible is equipped with a standard 3.0-liter, I6, 300-horsepower, turbo engine that achieves 19-mpg in the city and 28-mpg on the highway. A 6-speed manual transmission with overdrive is standard, and a 7-speed manual transmission is optional.The 2011 BMW 1 Series is completely new in the BMW line-up for 2008, and the least expensive model in the range. Offering the same rear-wheel-drive power train and competent suspension as the 3-Series but in a smaller, and somewhat lighter body, the 1-Series is intended to evoke the driving satisfaction of the basic BMW 2002 of the 1960s and '70s, considered the first true sports sedan.