KBB.com Brand Image Awards. Scores 23 Highway MPG and 16 City MPG! This GMC Acadia boasts a Gas V6 3.6L/220 engine powering this Automatic transmission. Daytime running lamps, All wheel drive, WHEELS, 20 (50.8 CM) CHROME-CLAD ALUMINUM. This GMC Acadia Features the... via CarSoup