Despite the same few letters and one digit, the 2020 Mazda CX-30 doesn’t share much with the CX-3 sitting across the showroom floor. That’s a good thing. The CX-3 may have been the perfect small crossover for overseas, but it was too cramped for American tastes and um, well, waists. With the 2020 CX-30, Mazda has a crossover designed...