Electric car: does the "B" setting improve economy?

Netexporter

It is a good idea to apply the brakes occasionally, to clean the rust off, otherwise it could fail an MOT. I suspect the discs will easily last the life of the car, though.

Keep_pedalling

Reed_Richards said:

Yes, I did want advice on the BEV I am about to buy.  I was particularly confused by being used to a B gear on my hybrid Toyota.

I still don't see why an EV would ever want to apply the brakes unless regen alone was not stopping the car fast enough. 

With normal breaking the EV will use regen most of the time. I have noticed that occasionally it doesn’t I assume that is to keep the disks nice and shiny. 

Spies

In my EV I can shift into N whilst driving which completely disables regen and it's all mechanical braking, good when your coming off onto a slip road and you want to clean your discs. 

Ideally you want to maintain momentum so it's always preferable to let the car gather speed [energy] than using regen as you're losing some [energy] in doing so, obviously if allowing the momentum to gather incurs speeding then you have no choice but to regen.