OK, it's not available at the dealer but the guy doing it is hip deep in some interesting projects. He did the work for "Pimp my Rides" Special on Bio-diesel where a converted Impala smoked a Lamborghini in a 1/4 mile. He's also making a 1960 Lincoln diesel/electric hybrid for Neil Young.

http://www.autobloggreen.com/2007/10/20/biodiesel-turbine-super-capacitor-series-hybrid-hummer-60/