I want to install generic capability for future car charging. What 240v outlet on the outside of the house is acceptable?
In my humble opinion, I'd run #6-3 w/ground from the panel to a outlet box accessible from the outside and just cover it with a water tight cover. Wait until you get your car and then get the breaker and outlet according to the specs for your car. If you're running conduit, run a 1" conduit from panel to outlet box and pull the wire later on when you know the specs.