Every time? If I'm approaching a stoplight going 40mph, I have to come to a stop no matter what. You're saying it's better to coast to the stop (gaining 0% energy back) than use regen (get 65% back)? I don't agree...Regen is only around 65% efficient... Thus, every time you have to use it, you are throwing away energy... No regen or brakes is the most efficient.
Edit: Ok, I see what the logic is, it's good to keep in mind, but it's not usually practical in most situations. You (mostly) can't predict a light change, and starting to coast really far from a light will impede / infuriate traffic behind you. In a downhill scenario, coasting to preserve energy can lead to dangerous speeds. To each his own, but I'm happy to just drive the darn thing I've even been known to put in Sport mode and have fun on occasion.