Tesla Motors has outsold several luxury carmakers in California in 2013, on the strength of its Model S, seen here in the foreground. The Telsa Roadster is behind it. James Lipman/Telsa hide caption

itoggle caption James Lipman/Telsa

A Tesla Model S drives outside the Tesla factory in Fremont, Calif., on June 22. The electric car was named Automobile of the Year by Automobile Magazine and Car of the Year by Motor Trend. Paul Sakuma/AP hide caption

itoggle caption Paul Sakuma/AP