The second-generation GMC Acadia is shorter and 500 pounds lighter than the old model. The ride is steady and composed and handling is responsive. A 2.5-liter four-cylinder engine is standard, but the mainstream engine is a smooth 3.6-liter V6 that returned 19 mpg in our tests, which isn't a standout. This family-friendly, three-row SUV is very quiet, the front seats are comfortable, and the infotainment system is easy to use. The outboard second-row seats can slide and tilt forward, even with a child seat in place. But many luxury features, such as four-way adjustable lumbar, a power sunroof shade, and auto-up windows all around are missing on our high-end Denali SUV. Available safety features includes forward-collision warning with automatic braking, pedestrian detection, and blind-spot monitoring.