Car-sharing service car2go is injecting a little luxe into its lineup. The Daimler-owned company, which has more than 1 million registered members in 29 cities globally, is adding 75 four-door Mercedes-Benz B-class vehicles to its fleet in Calgary, Toronto, and Vancouver. The pilot program, which launched Monday, will offer members an alternative to the car-sharing company’s signature vehicle: the diminutive two-door Smart Fortwo vehicle. “People think we’re a Smart (car) brand, and we’re not,” CEO…