I looked up B Mode on Ariya ,Regen braking, it returns energy to battery when braking which could extend range and brakelife. It all depends on your driving if braking alot. I am still not sure which is better I will have to compare when I get car. There is just to much to read so review yourself to see if my statement is correct. just another item to think about,maybe some current owners can let us know. Just trying to get as much input before arrival date. thanks