Among large luxury sedans, Tesla dominates Mercedes (also Audi, BMW, Lexus)

2016 Tesla Model SThe Tesla Model S has been on sale for just over four years now, and its global sales seem to be staying steady. They're strong enough, in fact, that Tesla Motors claims the electric car dominates its competitive segment. That's a trend first noticed back in 2013, and a claim that relies on exactly how the competitive segment for the Model S is...