Finished writing the memoire of my research titled-Asia, Transportation and Sustainability. Now I think trying to create sustainable cars is the wrong approach to sustainability.
As long as the car runs in a city designed for horse carriages, it carries its own 20% efficient engine, it carries energy to last 700 miles when the average travel is just 50 miles, it provides 5 times more space than require, it weighs 10 to 30 more than the single occupant normally sat in it and soon on, the car will never achieve maximum efficiency and hence maximum sustainability.
The only way of achieving true sustainability will be rethinking the whole system. Thinking at macro level and not micro level, thinking of the context, the people, the urban fabric, the energy structure, the transportation network, the materials before thinking of the car.