We got 18 mpg overall in our tests. Towing capacity is 5,000 pounds. The roomy cabin is very quiet, and the ride is comfortable, befitting Buick's flagship. The third-row seat is relatively roomy for the class. The infotainment system is easy to use, and connectivity features abound. But the unintuitive gear selector is fussy and a nuisance to use in parking maneuvers. The manual sunshade for the sunroof is out of place, given the Buick's price. City-speed automatic emergency braking and forward collision warning are standard only on top-level versions costing more than $50,000.