While we're a bit weary of the green-theme that seems to be pervading the Frankfurt Motor Show, this latest preview seems to meld both environmental aspects and performance offerings into one cohesive package. Germany's FourMotor will be showing off its BioConcept Mustang GT RTD to the masses next week, although the moniker "concept" doesn't quite do it justice, as the GT RTD has already competed in the 24-hour endurance race at the Nurburgring.

Powering the concept is a turbo'd two-liter in-line four running off of bio-diesel, which produces 280 hp and 369 lb.-ft. of torque. The chassis is still pure Americana, but the stock steel body panels have been nixed in favor of a plastic composite made of plant fibers to reduce weight and lend credence to the GT's environmental cred. Hmm... a turbocharged, four-cylinder diesel Mustang. We're perfectly OK with that.

[Source: Auto Motor und Sport via Motor Authority]