Guys, hold your horses. All I said is that it displayed behaviour that you would expect from a CVT. I did not say that it is a CVT or has a CVT, nor did I say that it is not a CVT or has no CVT. I am not going there any more ;-)
Why not use Save mode? Well, in theory, engaging Save mode at highest possible SOC is the same as Charge mode. But in practice it is not, at least not under demanding conditions. When you ask a lot of power at the bottom of the hysteresis cycle, the battery SOC will drop below the low water mark. From then on, Save mode will try to maintain that lower SOC level instead of the original level. It will not try to recover the lost SOC once power demand is reduced. By the handful, you will loose SOC. In Charge mode, SOC can also drop. But at least the cr will try to recover some of the last charge at times of lower power demand.