For 2013, the Flex has become a bit more fuel-efficient, though it still isn't among the most frugal in its class. With the base 3.5-liter V-6 incorporating Ti-VCT (variable camshaft timing), EPA fuel economy ratings improve by 1 mpg all around, without any change in gear ratios, to 18 mpg city, 25 highway.Adding all-wheel drive cuts into the numbers significantly: the AWD Flex earns an EPA rating of just 17/23 mpg. From there, it's another step down with the turbocharged Flex EcoBoost to 16/23 mpg.
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