If a black Uber car isn't a cool enough ride for you, Denver's Yellow Cab has an idea. Well, not really Yellow Cab, but its sister company, Phoenix-based ExecuCar. The company has added two fully electric Tesla Model S 70D luxury sedans to the company's premium black car service in Denver. Right now, the cars are available for customer bookings to and from Denver International Airport and other points in Denver and Boulder. Base rate for a Tesla from downtown Denver to DIA is the same as ExecuCar's...