That Particular Feature Doesn't Work Unless the Perpetual Motion Drive is Also Engaged

John Broder:

I was given battery-conservation advice at that time (turn off the cruise control; alternately slow down and speed up to take advantage of regenerative braking) that was later contradicted by other Tesla personnel.

Whatever else we've learned from this dustup, the Times' energy reporter (and at least one Tesla employee) apparently has a tenuous grasp on thermodynamics.