KBB.com 10 Most Affordable 3-Row Vehicles. Only 33,699 Miles! Boasts 25 Highway MPG and 17 City MPG! Dealer Certified Pre-Owned. This GMC Acadia delivers a Gas V6 3.6L/223 engine powering this Automatic transmission. WHEELS, 4 - 20" X 8.0" (50.8 CM X 20.3 CM) BRIGHT... via HomeNet, Inc.