The BioConcept Mustang GT RTD is a Mustang with a turbocharged 2.0L diesel engine which is fueled by B100 biodiesel. This engine is capable of producing 280 hp and 369 torque which roughly equivalent to the base Mustang GT engine. The body panels are also a composite material compared to the normal metal obviously trying to reduce more weight to help boost the diesel torque and of course make Ford look green.
Source: Jalopnik and Autoblog Green