That is very depending on the country and the provider and if you have a contract. It’s quite a complex situation.
It ranges from "electricity will cost you a little more per kilometer than gas" (very rare) to "electricity is slightly cheaper than gas" (most common) to "filling up your car with electricity gets you money back". (rare, but more common last year)
For Americans: My 1984 VW does 1l/8.5km. A full tank costs me over €95 in the Netherlands, and over €70 in neighboring countries. Driving to do a week surfing in France (2x1500km) costs me over €800 in petrol.
At home? Sure. Public chargers can have pretty significant margins, though.
European cars are (were?) more fuel efficient than US ones. I guess, partly because of the price of petrol in Europe. There are Dodge Rams, oversized SUVs and other rediculously inefficient cars driving on dutch roads, but far less common than in the US.
If you can do the majority of your charging at home, then it is significantly cheaper - but even someone without a home charging set up will find it is cheaper to run an electric car in the UK.
X.
BP currently charge £0.65 per kwh and if a car gets 4 miles per kwh the you’re paying 16.25p per mile
So my car getting thrashed at 42 mpg using £1.36 Costco petrol costs about 14.7p per mile
And that’s not taking into account any of the finance , insurance or anything else.
Or that fuel tax is about 80% of the petrol cost.