Yeah, running a 240V 50A outlet in a garage in most homes would be fairly cheap, since it's usually not going very far from the main panel. So might as well do it if you're already spending a huge chunk of change on an electric car.
The last time we hired an electrician to run about 30 feet from a panel to a new 50A sub-panel across the shop for a project was around $800 IIRC.