Unforunately, with todays saftey requirements, I don't think a big car like the Challenger can get light unless you start removing serveral hundred pounds of airbags, and computer equipment. The original car was not that light in the first place. Maybe they need to take GM's approach for "on-demand" power like the Northstar has. Overdrive has come along way towards gas milage as well. 6 speed manu-matic would be nice.
Mike