GasTankSize
Makes Gas prices Fuel system recalls Calculators Guides About

2015 Ford Flex Gas Tank Size & Fuel Capacity

Wagon 6 trims listed 1 fuel-system recall ← 2014 2016 →

Fuel tank capacity

18.6gal · 70 L

The 2015 Ford Flex has a fuel tank capacity of 18.6 gallons (70 liters) on every trim.

A full tank is good for roughly 428–465 highway miles or 298–335 miles around town, going by the EPA ratings.

18.6 gal · Bigger than 54% of 2015 models we list.

Highway range
428–465 mi
City range
298–335 mi
Fuel
Regular unleaded
EPA combined
19–20 MPG
EPA size class
Standard Sport Utility Vehicle

2015 Ford Flex fuel tank capacity by trim

What changes the tank sizeTap an option to filter the table

Drive
no difference
Engine
no difference

All 6 trims

MPG and range are city / highway.

TrimEngineDrive Tank Fuel MPG city / hwy Range city / hwy
Limited 4dr Wagon 3.5L 6cyl 6A · FWD · Regular MPG 18 / 25Range 335 / 465 mi 3.5L 6cyl 6A FWD 18.6 gal70 L Regular 18 / 25 335 / 465 mi
Limited 4dr Wagon AWD 3.5L 6cyl 6A · AWD · Regular MPG 17 / 23Range 316 / 428 mi 3.5L 6cyl 6A AWD 18.6 gal70 L Regular 17 / 23 316 / 428 mi
Limited 4dr Wagon AWD w/EcoBoost 3.5L 6cyl Turbo 6A · AWD · Premium (recommended) MPG 16 / 23Range 298 / 428 mi 3.5L 6cyl Turbo 6A AWD 18.6 gal70 L Premiumrecommended 16 / 23 298 / 428 mi
SE 4dr Wagon 3.5L 6cyl 6A · FWD · Regular MPG 18 / 25Range 335 / 465 mi 3.5L 6cyl 6A FWD 18.6 gal70 L Regular 18 / 25 335 / 465 mi
SEL 4dr Wagon 3.5L 6cyl 6A · FWD · Regular MPG 18 / 25Range 335 / 465 mi 3.5L 6cyl 6A FWD 18.6 gal70 L Regular 18 / 25 335 / 465 mi
SEL 4dr Wagon AWD 3.5L 6cyl 6A · AWD · Regular MPG 17 / 23Range 316 / 428 mi 3.5L 6cyl 6A AWD 18.6 gal70 L Regular 17 / 23 316 / 428 mi

Tank figures are the manufacturer's rated capacity, sorted smallest tank first. Range is tank size times EPA city or highway MPG.

How far a 2015 Ford Flex goes on a tank

Gallons left and the distance they cover at each mark on the fuel gauge, at EPA city and highway mileage. At the combined rating of 20 MPG, a full 18.6-gallon tank covers about 372 miles.

GaugeGallonsHighway milesCity miles
Full18.6465335
3/414.0349251
1/29.3233167
1/44.711684
1/82.35842

Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 750 gallons, roughly 40 full tanks.

Fuel gauges aren't perfectly linear and the low-fuel light comes on with a few gallons still in the tank, so plan your stop before the last eighth.

EPA combined
19–20 MPG
Tailpipe CO2
438–458 g/mi
EPA greenhouse score
4–5 of 10
Source
EPA ratings

What it costs to fill up a 2015 Ford Flex

$79.42 to fill the 18.6-gallon tank from empty with regular, at this week's US average of $4.27 a gallon.

TankFuelUS avg / galFrom emptyFrom 1/4 tank
18.6 galRegular$4.27$79.42$59.57
18.6 galPremium$5.28$98.21$73.66

By region, 18.6-gallon tank

RegionRegular / galFill from empty
East Coast$4.02$74.77
Midwest$4.27$79.42
Gulf CoastLowest$3.70$68.82
Rocky Mountain$4.46$82.96
West Coast$5.42$100.81
CaliforniaHighest$5.89$109.55

Prices: U.S. Energy Information Administration retail averages for the week of October 26, 2026. This week's prices by state and city.

Your own price

  • 18.6-gallon tank$79.42
  • A year of driving (15,000 mi)$3,202

Starts at the US average for regular; type in what your station charges. For other tank sizes, use the fill-up calculator.

Flex tank size in other years

The 2015 Flex uses the same 18.6 gal tank as every Flex since 2009.

Model yearTankLongest highway range
2019 Flex 18.6 gal 428 mi
2018 Flex 18.6 gal 428 mi
2017 Flex 18.6 gal 428 mi
2016 Flex 18.6 gal 428 mi
2015 Flex 18.6 gal 465 mi
2014 Flex 18.6 gal 465 mi
2013 Flex 18.6 gal 465 mi
2012 Flex 18.6 gal 446 mi
2011 Flex 18.6 gal 446 mi
2010 Flex 18.6 gal 446 mi
Ford Flex fuel tank by model year
20092010201120122013201420152016201720182019
← 2014 Ford Flex Every Flex year 2016 Ford Flex →

2015 Ford Flex fuel system recalls

NHTSA lists 1 fuel-system recall for the 2015 Ford Flex, out of 4 recalls in total. A recall applies only to the vehicles named in it, so check your VIN.

Delivery · Fuel pumpAug 25, 2016 · NHTSA 16V621000 · Ford Motor Company · 77,502 vehicles

Ford Motor Company (Ford) is recalling certain model year 2013-2015 Ford Taurus, Ford Flex, Lincoln MKS and Lincoln MKT vehicles equipped with 3.5L GTDI Ecoboost engines and 2013-2015 Ford Taurus Police Interceptor vehicles. A component within the fuel pump electric module (PEM) may overheat causing a loss of electrical power to the fuel pump.

Risk and remedy

Risk: A loss of power to the fuel pump will cause the engine to stall or prevent the vehicle from starting, increasing the risk of a crash.

Remedy: Ford will notify owners, and dealers will inspect the fuel PEM part number and replace the fuel PEM, as necessary, free of charge. The recall began on December 1, 2016. Owners may contact Ford customer service at 1-866-436-7332. Ford's number for this recall is 16S31.

All Ford fuel recalls Look up your tank by VIN

Frequently asked questions

What is the fuel tank capacity of the 2015 Ford Flex?

The 2015 Ford Flex holds 18.6 gallons (70 liters) on every trim we list.

How many gallons and liters does the 2015 Ford Flex gas tank hold?

The 2015 Ford Flex tank holds 70 liters, or 18.6 gallons in US gallons.

Does AWD change the 2015 Ford Flex gas tank?

No. FWD and AWD versions of the 2015 Ford Flex use the same 18.6 gal tank.

How far can a 2015 Ford Flex go on a full tank?

About 428–465 miles on the highway and 298–335 miles in town, going from full to empty at its EPA ratings. Expect less in practice, since nobody runs the tank dry.

How many miles can a 2015 Ford Flex go on a quarter tank?

About 116 highway miles or 84 in town from the 18.6-gallon tank, which has roughly 4.7 gallons left at the quarter mark. Gauges aren't exact, so treat that as a guide.

What gas does the 2015 Ford Flex take?

Regular unleaded, or Premium unleaded (recommended), depending on the engine. The label inside the fuel door confirms it for your car.

How much does it cost to fill up a 2015 Ford Flex?

At the US average of $4.27 a gallon for regular (EIA, week of October 26, 2026), filling the 18.6-gallon tank from empty costs $79.42. It ranges from $68.82 in the Gulf Coast to $109.55 in California.

How much does a full tank of gas weigh in a 2015 Ford Flex?

About 115 pounds for the 18.6-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.

Has the 2015 Ford Flex had a fuel pump or fuel system recall?

Yes. NHTSA lists 1 fuel-system recall for the 2015 Ford Flex: 16V621000 (delivery · fuel pump). Check your VIN at nhtsa.gov/recalls to see if your car is affected.

Sources

  • Tank sizes: manufacturer-rated capacities from US-market specifications, checked against independent references. Updated October 2026.
  • MPG and range: EPA ratings (fueleconomy.gov). Range is tank size times EPA MPG.
  • Fuel prices: U.S. Energy Information Administration, week of October 26, 2026 (this week's prices).
  • Recalls: NHTSA recall database (Ford fuel system recalls).

Does your owner's manual say something different? Let us know and we'll fix it. More on how we check the numbers.

Other 2015 Ford models

C-Max Energi14.0 gallons C-Max Hybrid13.5 gallons Escape15.5 gallons Expedition28.0–33.5 gallons Explorer18.6 gallons F-15023.0–36.0 gallons F-250 Super Duty35.0 gallons F-350 Super Duty35.0 gallons F-450 Super Duty37.5 gallons Fiesta12.4 gallons Focus12.4 gallons Focus ST12.4 gallons