Recently the idea of oil problems have brought up the question of a post oil world car. Now the steam powered car used to be a very efficient way to go but I am guessing that with all of the technology that we have today we could improve on that by quite a bit. What would it take to build a car from scratch that ran on something you could make from home or get cheaply/easily and what would be the best/cheapest/most reliable way to go? Solar powered battery electric motor? Steam engine? Browns gas? alcohol? other... i would think that a couple of solar panels and batteries with an electric motor would be the cheapest since there is no need to keep buying gas or making alcohol but its also the highest start up costs. Maybe a hybrid system is the way to go since combustion engines produce heat and need cooling. What would YOU make if you could?