Ahead of its public debut at the North American International Auto Show, Buick today revealed the Avista concept - a 2+2 coupe that pushes the brand's contemporary design ethos and rekindles its historic performance roots. A sleek, sweeping proportion is the foundation for this vision of a contemporary grand tourer, with a 400-horsepower twin-turbocharged V-6 driving the rear wheels and a driver-focused cockpit offering a comfortable, connected center of control. "The Avista embodies the dynamic soul...