Presumably because the etron technology was retrofitted into the A3, there are disparate controls for EV, Hybrid, Hold Battery, Charge Battery drive modes and Comfort, Auto, Dynamic, and Individual Drive modes. The biggest problem is that a default cannot be set for the EV mode, but can for the Drive modes. If you are on hybrid mode to conserve Plug in Battery, and happen to stop the car, it defaults to EV mode upon restarting. You may not realize it, and deplete your entire battery - which of course affects gas milage. Why did audi not hold the mode selected? All the other features in the car return to to what was set last upon restarting. This could easily be added and settable in the individual drive mode setting, if the interface was well thought out and integrated with the EV modes.