Good luck finding a
It's hard to find a megacharger. You would have to build one. Might want to calculate the cost to build one of those if the electric utility even allot you that much power.
If you can find a charger, it won’t be 7 cents per kw A regular Tesla auto cost as much as some cars to fill up now.
If the electricity is coming from the burning of coal or fuels, you are doing more harm than good.