http://www.preferredbuickgmc.com/ 616-604-4260 Also available is a 3.0-liter DOHC direct injected V-6 engine delivering an estimated 264 horsepower. Both engines are mated to a six-speed automatic transmission. Terrain's rack-mounted electric power steering system provides greater fuel efficiency on four-cylinder-equipped models, saving nearly 11 miles per tank of gas.