Better than carbon fibre: http://www.kurzweilai.net/graphene-paper-thin-as-paper-and-ten-times-str...
Looks like it would be a lot cheaper and stronger. Of course, everyone will be on this like white on rice, not just TeslaMotors.
Using a synthesized method and heat treatment, the UTS research team produced material with extraordinary bending, rigidity and hardness mechanical properties. Compared to steel, the prepared graphene paper (GP) is six times lighter, five to six times lower density, two times harder with 10 times higher tensile strength, and 13 times higher bending rigidity.
The researchers foresee the use of graphene paper in the automotive and aviation industries, allowing the development of lighter and stronger cars and planes that use less fuel, generate less pollution, are cheaper to run, and are ecologically sustainable.