Thanks for sharing Carst, great info, I do have one question. does the 2018 Volt allow 30-Amp Charging? because the 2017 and 2016 can only go to 12-amps?. I have a level-2 240-volt charger that is rated for 30-amps, but my 2017 will only take a max of 12-amps. so I don't use the full potential of the 30-amp capability. you stated that: "3. 30-40 amps (240 volt Charger) in 4.5 hours. do you have that ability with the 2018 Volt?
Also a comment, I purchased a level-2 240-V 30-amp rated charger on Ebay for $ 325.00 and installed it myself, it is really easy, just add a 40-amp 2-pole circuit breaker to your electrical panel and run the conduit and wire. very simple, no need to spend much more than that.
another item: you stated that: "Energy cost depends on peak or off peak hours and costs the same not matter what charger your are using." this is true of the 240-Volt charges, but if you are still using the 110-volt 15-amp standard level -1 charger then the amount of kWh that is used will be double. the Utility company charges "per" kWh so the less you use the less it costs, and the 240-V Level-2 chargers use half as much kWh. as the 110-Volt
In My Opinion the Level-2 chargers do not charge the car any faster then the level-1 version, simply because the car will only take a maximum of 12-amps no matter what. so the benefit of the level-2 chargers do not include a faster charge. the only benefit is for the lower cost of the power that is used.