https://www.cnn.com/2018/12/13/business/electric-cars-charge-bmw-porsche/index.html

As for efficiency, there is also the efficiency of the charger itself. I'm just saying it needs to be 'total input vs total output'. The plus size for electrics is that you move the pollution outside of the city. To some extent that is the lure of natural gas engines. They also do not have the range etc. Solar recharge probably has a way to go. Still, if the vehicle sits 4 to 8 hours, how much charge in that time? Also, charging electrics off peak hours?