The energy equivalent to all the gas not burned in the EV's will have to come off the grid. One or two cars on a block, probably OK. If every house has 2 cars, that is a whole lot of energy.
At least the extra load would be largely at night, not during peak hours. But expect your power bill to increase to pay for the new power plants/lines to handle the load.
This is a good point. Americans have an appalling ignorance of even rudimentary science.
Don't forget conversion losses. Converting fossil fuels to electricity involves a ~70% conversion loss. Trasmission lines have substantial losses as well.
It will take double the amount of fossil fuel to power EVs versus burning the fuel directly in an engine.