I may have overstated it. What I meant was simply when changing lanes you need to accelerate faster than cruising speed to make up for the distance of the lane

I may have overstated it. What I meant was simply when changing lanes you need to accelerate faster than cruising speed to make up for the distance of the lane shift if you want to stay evenly separated from the cars around you, versus drifting backward about a car length as you move between lanes. In addition I like to have some forward movement while changing lanes on a highway, so that if there is someone (several car lengths) behind me in the adjacent lane they know they won’t have to slow down. So you can add a bit of speed as you make the lane change and then bleed it off in regen to return back to that lane’s cruising speed. It should not be enough of a delta to involve any kind of brake light. The energy loop is extremely efficient e.g. if you are going 60mph to bump up to 65mph and then back to 60mph, like 90% is reclaimed, from the energy chart display, you get a spike up and then down in consumption whichs appear to be symmetrical. Actually, if you lane change in AutoPilot I believe it will do something similar. It does not change (semi-)autonomously lanes without applying some power.