Something else I found.
A very interesting invention by the British of course.
It's called TIGERS (Turbo-generator Integrated Gas Energy Recovery System)
Again, about 10% saving on fuel and lowers emissions.
A Switched Reluctance Drive (Generator) is driven by the high energy gases from the exhaust system, enough to run the cars full electrical system.
Of course, this has to rely on enough energy (Pressure) being generated, so how is this going to assist with the increasing congestion?
And can apparently, be fitted to all vehicles.
I have yet to find any information on any manufacturers taking this up but the company expect it to be production ready by 2012.
Here are some links.
A couple of other interesting developments on their homepage too