The large, three-row Buick Enclave underwent a full redesign for 2018. It provides improved fuel economy, more space, and a variety of safety and connectivity features. Power comes from a lively 3.6-liter V6 teamed with a smooth, responsive nine-speed automatic. 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 a Buick flagship. The third-row seat is relatively roomy for the class. The infotainment system is easy to use, but the unintuitive shifter is a nuisance in parking maneuvers. A manual sunshade for the sunroof and only a two-way lumbar adjustment for the seat are odd, given the price. Low-speed automatic emergency braking and forward-collision warning are standard, though only on top versions costing more than $50,000.