Yes, we would really need to know the electric cost, as it is the fuel cost of an electric car, to compare against the cost of gasoline for a gasoline powered car.
In fact, you would have to lay out the purchase price of the vehicle, repair and maintenance, fuel costs, and then that cost of replacing the electric car battery. Lay it all out there, and see how much that electric car costs you, say over a 10 year period, vs. the gasoline powered car.
“Yes, we would really need to know the electric cost, as it is the fuel cost of an electric car, to compare against the cost of gasoline for a gasoline powered car.”
Data readily available and included on window sticker.