Two tons of FWD awesomeness..
I remember reading about this last year, but its looking like it'll be put into production. Basically they use a closed-loop system to heat coolant with the catalytic converters and/or mufflers, then use the steam to drive swash plates (like an a/c compressor) attached to the crankshaft. Makes an engine up to 15% more efficient
Combining the innovative assistance drive with a 1.8 litre BMW four-cylinder engine on the test rig reduced consumption by up to 15 percent and generated 10 kilowatts more power and 20 Nm more torque. This increased power and efficiency comes for, well, … nothing. The energy is extracted exclusively from the heat in the exhaust gases and cooling water so it is essentially a quantum leap in efficiency.