Buick is positioned in between mainstream and luxury brands. Most models are upscale and refined, with well-crafted interiors and straightforward infotainment systems. Most Buicks can’t match the latest competitors’ gas mileage, however. The brand has reinvigorated and expanded its portfolio of late, and it is now quite the international brand, sourcing models from around the globe. And it is increasingly focused on SUVs. Some Buicks do quite well in our tests.