That said, drafting behind a car with a giant wind break on top of it is probably worth a lot more, and Tesla was the unsung hero of this effort. There were reassurances prior to this effort that the car would be there only to give time and a guide to the projected finish, but it was clear from the outset that the car was doing the main drafting job – they even had lasers pointing to athletes where to run. I’ve seen aerodynamic models of the drafting effect of this car, by the way, and it makes a massive difference, and the distance they ran behind it was no accident. It was an engineering victory today, more than one of physiology.