With Autopilot and agreement between vehicles, allow one Tesla vehicle to tailgate another Tesla vehicle to reduce power consumption.
The lead vehicle could communicate driving intentions allowing perfect synchrony and very close distance.
There could even be a reward system so that if you allow connected slipstreaming behind you the car behind pays you a little per mile to use your drag.
Moderator: This may be illegal to do in many states, but if made safe, perhaps the laws could be changed. Such a feature is planned for the Tesla Semi.