he recommended fuel type for a Ford Flex
Regular Unleaded - like anything else.
From pg 349 of the Flex 2009 manual: Fuel quality If you are experiencing starting, rough idle or hesitation driveability problems, try a different brand of unleaded gasoline. “Premium” unleaded gasoline is not recommended for vehicles designed to use “Regular” unleaded gasoline because it may cause these problems to become more pronounced. If the problems persist, see your authorized dealer.
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