The Audi A3 family is growing. After the launch of the three-door hatchback, Volkswagen’s premium brand now is adding the five-door Sportback. To justify the “Sportback” moniker, Audi hasn’t simply added two doors. While the front end remains unchanged, the five-door’s wheelbase is 1.4 inches longer than is the three-door, the tailgate and rear bumper [...]