One Owner Accident Free History Report!!. Terrain SLE-2. 4D Sport Utility. and 3.6L V6 DGI DOHC VVT. Flex Fuel! Don't let the miles fool you! Imagine yourself behind the wheel of this superb 2013 GMC Terrain. Consumer Guide praises Terrain for its fuel economy. passenger and cargo room. Fore and aft adjustable second-row seat....