After almost a decade on the market, the large Enclave is set to be replaced by an all-new version. The outgoing model has a firm, comfortable ride and secure handling. The cabin is quiet, the interior is nicely finished, and the seats are comfortable. But the Enclave shows its age through some of the outdated controls and limited feature content. The 3.6-liter V6 engine and six-speed automatic transmission are smooth and unobtrusive, but the engine feels taxed and at times the powertrain has to work hard to move this large SUV. In our tests the Enclave returned a paltry 15 mpg overall. Adults can fit in the roomy third row, a plus. Forward-collision warning and lane-departure warning systems are available.