What are the costs?
At home, the average overnight electricity rate is around 14p per kWh. This means that charging your e-tron could cost you as little as 2-3p per mile*. Whilst some public charging stations are free to use, Public charging stations have a greater power output, so the cost of charging publicly will likely be higher than at home, though pricing may vary.
*The range of the vehicle, and therefore the cost per mile will not only depend on the efficient use of the energy from the battery by the vehicle itself, but also on driver behaviour and other non-technical factors such as driving and environmental conditions.