I happen to live next to a free charger provided by the state, and not far from a free fast charger provided by the dealership, so it’s essentially free for me.
Electricity here usually costs about $0.12 per kwh, which can charge the car for 4-5 miles of range. That’s $0.84 to go 28 miles.
Most people charge at home just by plugging the car into an outlet, so I have no idea how that would be taxed. With EVs we pay the road tax during vehicle registration, which is an extra $100 each year.