I like to think of the IQ score like a measurement of horse power in the engine. The direction, speed, control and distance is determined by the driver, which these tests don't properly measure. Richard Feynman is clearly a better driver than most of us.

Still, no amount of good driving will make a Ford Escort perform like a Ferrari in the hands of an average driver, and Richard Feynman's brain was a Lear Jet. Or something.
ETA: I seem to have run afoul of a spam filter. Still, I doubt
this would perform like a Ferrari in the hands of an average driver either, or for that matter in the hands of Albert Einstein. :|