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Only 55,403 Miles! Scores 22 Highway MPG and 16 City MPG! This Ford Flex delivers a Regular Unleaded V-6 3.5 L/213 engine powering this Automatic transmission. ENGINE: 3.5L TI-VCT V6 (STD), Wheels: 19" Premium Luster Nickel-Painted Aluminum, Voice...SouthwestMotorsHighway · 3 weeks ago on HomeNet, Inc.