Check out the April version of Roundel if you get it.
Writer Bob Roemer reports that BMW is working on using steam power to increase power and save gas naming it the process or product Turbosteamer. Basically BMW is using the hot exhaust gases to heat up ethanol (water is not used because ethanol has a lower boiling point). The steam created is moved through "an 'expander machine' that has a connecting rod directly linked to the crank-shaft- similar to a steam locomotive- to provide more power to the engine." Their test was on a 1.8 liter engine which added around 10 ft/lbs of torque, and save about 15% on gas consumtion. This process or product probably will not be ready for another ten years.
Pretty nifty idea in my opinion. I just wish that I was out of school already so I could have designed this
The source was of course from April 2006 edition of Roundel, pages 42-43.