Reply #85: A few points:

[Turbineguy]

In order for regenerative braking to work to charge the battery, the voltage that the motor produces must be greater than the battery voltage.

The system that controls the regenerative braking would add weight, thereby negating some of the savings.

Central power stations produce power at double the efficiency of automotive engines.

In the end, most of the power that is wasted is due to bad driving habits and technology cannot overcome this.