The fourth-generation M3 escalates BMW performance to a new level with a 414-hp V8 engine. It arrives in the U.S. in Spring 2008. Models include: coupe (designator E92), sedan (E90) convertible (E93) station wagon (touring, E91) destined for non-U.S. markets While it looks visually similar to the base BMW 3 Series coupe, BMW says the only common parts are the doors, trunklid and fuel-filler cap. BMW reports fuel economy can be greater than 20 mpg, but some magazine testers have gotten half that, suggesting a M-specific high-duty cycle filler cap might have been in order, too. The most noticeable visual difference is the carbon fiber roof panel used to reduce weight. Other cues are the powerdome on the hood, side intakes, and side ventilation gills, and aerodynamic bodywork. The M3 uses a six-speed manual gearbox. The once-promising, now-considered-jerky SMG is not available, but reports suggest 2008 avaialability of a seven-speed double clutch transmission (DCT) similar to Audi's DSG (S tronic) automated manual gearbox. Meaning: manual or automated shifting but no clutch pedal. BMW says the price will be in the "low sixties" when it debuts in the U.S. in 2008.