2019 Mercedes-AMG GT S Roadster is a tempting tweener

Mercedes-AMG’s family of potent AMG GT cars is gaining a new member, with the 2019 AMG GT S Roadster offering a third droptop version to better hear the V8. Expected to arrive in the US late this year, the new car is expected to do 0-60 mph in 3.7 seconds, balancing the affordability of the entry-level Roadster and the performance …