I'll start by saying I am fully on board with optimizing ones use of fuel both for financial reasons and for environmental reasons.
But some hypermilers are just plain not thinking it though (or just selfish).
Anyway, what I saw today was a Prius with several mods for efficiency (small rear views, removed antenna, some body mods) that was turning left and came to a stop about three car lengths before the stop line in the turn lane.
At the same time 3 other cars wanting to turn left tied to get in the turn lane, but the last two could not.
This was an intersection where the green arrow for the left happens at the end of the green to proceed straight.
This caused several other cars wanting to proceed straight to get stuck in the lane, so to save an entirely insignificant amount of fuel/battery power, this guy caused a half dozen other cars to sit idling instead of being able to proceed.
Don't do this, or other similar things hypermilers...