2017 Ford Flex Gas Tank Size & Fuel Capacity
Fuel tank capacity
18.6gal · 70 L
The 2017 Ford Flex has a fuel tank capacity of 18.6 gallons (70 liters) on every trim.
A full tank is good for roughly 391–428 highway miles or 279–298 miles around town, going by the EPA ratings.
18.6 gal · Bigger than 57% of 2017 models we list.
- By trim
- Gas cap & parts
- Fuel essentials
- Miles per tank
- Fill-up cost
- Other years
- Fuel recalls
- Pump & gauge parts
- FAQ
2017 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.
| Trim | Engine | Drive | Tank | Fuel | MPG city / hwy | Range city / hwy |
|---|---|---|---|---|---|---|
| Limited 4dr Wagon 3.5L 6cyl 6A · FWD · Regular MPG 16 / 23Range 298 / 428 mi | 3.5L 6cyl 6A | FWD | 18.6 gal70 L | Regular | 16 / 23 | 298 / 428 mi |
| Limited 4dr Wagon AWD 3.5L 6cyl 6A · AWD · Regular MPG 16 / 22Range 298 / 409 mi | 3.5L 6cyl 6A | AWD | 18.6 gal70 L | Regular | 16 / 22 | 298 / 409 mi |
| Limited 4dr Wagon AWD 3.5L 6cyl Turbo 6A · AWD · Premium (recommended) MPG 15 / 21Range 279 / 391 mi | 3.5L 6cyl Turbo 6A | AWD | 18.6 gal70 L | Premiumrecommended | 15 / 21 | 279 / 391 mi |
| SE 4dr Wagon 3.5L 6cyl 6A · FWD · Regular MPG 16 / 23Range 298 / 428 mi | 3.5L 6cyl 6A | FWD | 18.6 gal70 L | Regular | 16 / 23 | 298 / 428 mi |
| SEL 4dr Wagon 3.5L 6cyl 6A · FWD · Regular MPG 16 / 23Range 298 / 428 mi | 3.5L 6cyl 6A | FWD | 18.6 gal70 L | Regular | 16 / 23 | 298 / 428 mi |
| SEL 4dr Wagon AWD 3.5L 6cyl 6A · AWD · Regular MPG 16 / 22Range 298 / 409 mi | 3.5L 6cyl 6A | AWD | 18.6 gal70 L | Regular | 16 / 22 | 298 / 409 mi |
| No trim matches all of these filters. | ||||||
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 2017 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 19 MPG, a full 18.6-gallon tank covers about 353 miles.
| Gauge | Gallons | Highway miles | City miles |
|---|---|---|---|
| Full | 18.6 | 428 | 298 |
| 3/4 | 14.0 | 321 | 223 |
| 1/2 | 9.3 | 214 | 149 |
| 1/4 | 4.7 | 107 | 74 |
| 1/8 | 2.3 | 53 | 37 |
Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 789 gallons, roughly 42 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
- 17–19 MPG
- Tailpipe CO2
- 468–523 g/mi
- EPA greenhouse score
- 3–4 of 10
- Source
- EPA ratings
What it costs to fill up a 2017 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.
| Tank | Fuel | US avg / gal | From empty | From 1/4 tank |
|---|---|---|---|---|
| 18.6 gal | Regular | $4.27 | $79.42 | $59.57 |
| 18.6 gal | Premium | $5.28 | $98.21 | $73.66 |
By region, 18.6-gallon tank
| Region | Regular / gal | Fill 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)$3,371
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 2017 Flex uses the same 18.6 gal tank as every Flex since 2009.
| Model year | Tank | Longest 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 |
2017 Ford Flex fuel system recalls
None of the 4 recalls NHTSA lists for the 2017 Ford Flex involve the fuel system.
2017 Ford Flex fuel pump and gauge parts
NHTSA lists no fuel-system recall for the 2017 Ford Flex, so a failed pump or gauge is a normal repair. These are the part numbers the makers list for it.
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Frequently asked questions
What is the fuel tank capacity of the 2017 Ford Flex?
The 2017 Ford Flex holds 18.6 gallons (70 liters) on every trim we list.
How many gallons and liters does the 2017 Ford Flex gas tank hold?
The 2017 Ford Flex tank holds 70 liters, or 18.6 gallons in US gallons.
Does AWD change the 2017 Ford Flex gas tank?
No. FWD and AWD versions of the 2017 Ford Flex use the same 18.6 gal tank.
How far can a 2017 Ford Flex go on a full tank?
About 391–428 miles on the highway and 279–298 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 2017 Ford Flex go on a quarter tank?
About 107 highway miles or 74 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 2017 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 2017 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 2017 Ford Flex?
About 115 pounds for the 18.6-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.
Has the 2017 Ford Flex had a fuel pump or fuel system recall?
No. None of the 4 recalls NHTSA lists for the 2017 Ford Flex involve the fuel system.
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.