As everyone guessed, that DontBlogAbouThis mystery BMW was in fact a test mule for the production version of the Vision EfficientDynamics concept. BMW today confirmed that their futuristic machine is heading into production as a 2+2 sports coupe with an innovative hybrid system. It was first revealed as a concept during the 2009 IAA Frankfurt Motorshow.

Here’s what they propose for the produciton version of this car to be: It’ll be a 2+2-seater with a height of just 1.24 meters, with drag coefficient to 0.22, and wing doors just as you saw in the concept. The BMW ActiveHybrid system that powers the car will be consisting of a 3-cylinder turbo diesel with a hybrid synchronous motor at the front axle and a full-hybrid engine at the rear axle enables an overall system output of 241 kW/328 bhp.

The projected performance figures for this car are 4.8 seconds for sprint from zero to 100 km/h – with an average fuel consumption in the EU test cycle (KV01) of 3.76 litters/100 kilometers, equal to 75.1 mpg imp, and a CO2 emission rating of 99 grams per kilometer. So you can kinda consider it as BMW’s answer to the Porsche 918 Spyder, not that they’re in the same class, but they both offer astonishing performance with unbelievable efficiency.

This unique relation between dynamic performance and efficiency derives from the high level of efficiency of all engine components as well as intelligent linking of the power output of the three engines, as well as precisely controlled energy management including brake energy regeneration. What is more, the study BMW Vision EfficientDynamics is conceived as a so-called plug-in hybrid. The lithium-polymer rechargeable battery housed centrally in a longitudinal chassis element and designed specially for this hybrid sports car can be fully charged at a conventional power socket within just two and half hours. The use of electrical energy alone permits zero-emissions motoring with a range of some 50 kilometres, while a 24-litre diesel tank extends the total action radius of the vehicle to up to 700 kilometres.

By developing a sports car based on the BMW Vision EfficientDynamics concept study for serial production, the Munich-based premium automobile manufacturer underscores its position as a global leader in the production of sporty vehicles with exemplary efficiency. All current models are fitted as standard with extensive measures for the reduction of fuel consumption and CO2 emissions. The innovations used for this purpose are based on the development strategy BMW EfficientDynamics, which also includes BMW ActiveHybrid technology as well as purely electrical drive systems. With the BMW ActiveHybrid 7 and the BMW ActiveHybrid X6, two serial production vehicles have already been launched in which a BMW-specific combination of combustion and electric drive results in an especially efficient increase in the driving dynamics so characteristic of the brand.