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Steve Griffin | Tribune file photo A new Tesla service center and car charging station at 2312 S. State St. was under contructi FILE - In this Saturday, Jan. 3, 2015 photo, shoppers check out the Tesla model S at the Tesla showroom at the the Third Street Pr This April 1, 2015, photo shows the Tesla Motors showroom in Salt Lake City the company built to sell its sleek electric cars, but In a photo from Tuesday, April 7, 2015 in Detroit, a Tesla Model S 70D is seen during a test drive. Electric car maker Tesla Moto Steve Griffin | Tribune file photo A new Tesla service center and car charging station at 2312 S. State St.was under constructi In this Tuesday, April 7, 2015 photo, a Tesla Model S 70-D electric car is test driven in Detroit. Tesla is going after mainstream