I came up with an interesting idea a few months back. I saw a voyager with AWD and though HUH did not know it came like that.
I thought it might be neat to PUT the AWD rear axles in my voyager but not the T case IE add in an electric motor with a simple relay on off switch to boost MPG.
Well it looks like others are thinking the same thing and even have prototypes built!!!
http://tinyurl.com/4dhyhk
Very cool! and retrofitable to ANY FWD car!