I think it is more useful to go by energy cost ratios. A while back I did the math for Chevy Bolt vs an ICE car that gets 39 mpg. The results were charging th

I think it is more useful to go by energy cost ratios. A while back I did the math for Chevy Bolt vs an ICE car that gets 39 mpg. The results were charging the Bolt would be cheaper per mile than filling the ICE car whenever G/E > 9.4, where G is the price of a gallon of gas and E is the cost of a kW of electricity.