Poor aerodynamics would make the difference smaller, not larger. We can drastically increase fuel efficiency by making our cars out of carbon fibre, and it doe

Poor aerodynamics would make the difference smaller, not larger. We can drastically increase fuel efficiency by making our cars out of carbon fibre, and it doesn't have to be more expensive or less safe. Check out Amory Lovin's concept car for one example. We believe lighter = less safe, despite evidence to the contrary (in reality it's smaller = less safe, lighter = safer). Perhaps computer controlled cars will allow us to stop feeling the need to fortify our cars more and more, making the road less safe for everyone.