18 MPG combined. That’s the headline when discussing the 2019 Ford Flex AWD with the 3.5L V6. It’s not a bragging point, but those who understand the Flex’s unique capabilities accept it as a trade-off. This isn’t a vehicle purchased for hypermiling, it’s chosen for its distinctive style, its spacious three-row seating, and its ability to haul people and cargo in comfort, regardless of the weather. Buyers prioritize space and practicality over outright fuel efficiency, making the Flex a niche vehicle with a devoted following.

City and highway performance

Those 18 combined miles per gallon break down into 16 MPG in the city and 22 MPG on the highway. The city figure reflects the demands placed on the naturally aspirated 3.5-liter V6 and the six-speed automatic transmission as it navigates stop-and-go traffic. The Flex’s considerable weight requires more energy to accelerate from each stop. On the open road, the 22 MPG figure is more palatable because the engine spends more time at a constant, relatively low RPM.

Keep in mind that the AWD system is always engaged, creating continuous driveline drag that impacts efficiency, even at highway speeds. Differences in driving style will have a greater effect on highway MPG than in smaller cars.

Annual fuel cost

The EPA estimates an annual fuel cost of $2,450 for the 2019 Ford Flex AWD 3.5L. This figure is calculated based on driving 15,000 miles per year, with a mix of city and highway driving, and using the EPA’s estimate for the national average fuel price. Your actual fuel costs will vary depending on your driving habits, the type of fuel you use, and local fuel prices. If you primarily drive in the city, or if gas prices in your area are higher than the national average, expect to pay more.

Conversely, if you do mostly highway driving and gas prices are lower, you’ll likely spend less, but the $2,450 mark provides a good baseline for comparing the Flex’s fuel costs to other vehicles in its class. You can also review FLEX MPG across all years on this site to get a sense of longer term trends.

Real-world expectations

While the EPA estimates provide a standardized yardstick, real-world MPG for the 2019 Ford Flex AWD 3.5L often varies. Owners frequently report numbers slightly below the EPA’s figures, particularly in areas with hilly terrain or with aggressive driving habits. Heavy use of air conditioning, carrying heavy loads, and winter driving conditions can also negatively impact fuel economy.

Some drivers who prioritize smooth acceleration and consistent highway speeds have reported achieving numbers close to, or even slightly above, the EPA estimates. Your individual driving style and conditions will play a significant role in the MPG you achieve. The Flex’s large frontal area creates significant aerodynamic drag at higher speeds, meaning that fuel consumption can increase noticeably above 70 mph.

How it compares

Compared to other three-row SUVs with all-wheel drive, the 2019 Ford Flex’s fuel economy is in the middle. The Toyota Highlander AWD achieves a combined 23 MPG with its V6 engine, a notable advantage. The Honda Pilot AWD typically delivers around 22 MPG combined. Vehicles like the Chevy Traverse AWD often come in around 20 MPG, and the Nissan Pathfinder with AWD often delivers comparable fuel economy to the Flex, at around 20 MPG combined.

The Flex buyer isn’t necessarily concerned with outright best-in-class fuel economy. They’re willing to trade a few MPG for the Flex’s unique styling, roomy interior, and distinctive character. Before purchasing, carefully consider all Ford fuel economy data.

Tips to maximize efficiency

Anticipate traffic flow and avoid sudden acceleration and braking. The Flex is a heavy vehicle, and each time you rapidly accelerate, you’re burning extra fuel to overcome its inertia. Smooth, gradual acceleration will conserve fuel, especially in city driving.

Maintain proper tire inflation. Underinflated tires increase rolling resistance, forcing the engine to work harder and consuming more fuel. Check your tire pressure regularly, following the recommendation on the sticker located on the driver’s side doorjamb.

Reduce unnecessary weight. Carrying extra cargo in the Flex, especially heavy items, adds to the vehicle’s overall weight and reduces fuel efficiency. Remove any items you don’t need from the vehicle to minimize the load on the engine.

Use cruise control on the highway. Cruise control helps maintain a consistent speed, which can improve fuel economy on long drives. Avoid using cruise control in hilly terrain, as the system may downshift frequently, negating any fuel savings.

Consider using a fuel additive periodically. Some owners have reported slight improvements in fuel economy after using fuel additives designed to clean fuel injectors and improve combustion efficiency. Look for reputable brands and follow the instructions carefully.