2018 Hyundai Sonata Gas Tank Size and Capacity
Fuel tank capacity
18.5gal · 70 L
The 2018 Hyundai Sonata has a fuel tank capacity of 18.5 gallons (70 liters) on every trim.
A full tank is good for roughly 592–685 highway miles or 426–518 miles around town, going by the EPA ratings.
18.5 gal · Bigger than 53% of 2018 models we list.
Listed separately: 2018 Hyundai Sonata Hybrid (15.9 gal), 2018 Hyundai Sonata Plug-in Hybrid (14.5 gal).
- By trim
- Gas cap & parts
- Fuel essentials
- Miles per tank
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- Compared
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- Pump & gauge parts
- FAQ
2018 Hyundai Sonata fuel tank capacity by trim
What changes the tank sizeTap an option to filter the table
- Engine
- no difference
All 16 trims
MPG and range are city / highway.
| Trim | Engine | Drive | Tank | MPG city / hwy | Range city / hwy | |
|---|---|---|---|---|---|---|
| Eco 4dr Sedan 1.6L 4cyl Turbo 7AM · FWD MPG 28 / 37Range 518 / 685 mi | 1.6L 4cyl Turbo 7AM | FWD | 18.5 gal70 L | 28 / 37 | 518 / 685 mi | |
| Limited 2.0T 4dr Sedan (built to 5/18) 2.0L 4cyl 8A · FWD MPG 23 / 32Range 426 / 592 mi | 2.0L 4cyl 8A | FWD | 18.5 gal70 L | 23 / 32 | 426 / 592 mi | |
| Limited 2.0T+ 4dr Sedan 2.0L 4cyl Turbo 8A · FWD MPG 23 / 32Range 426 / 592 mi | 2.0L 4cyl Turbo 8A | FWD | 18.5 gal70 L | 23 / 32 | 426 / 592 mi | |
| Limited 4dr Sedan 2.4L 4cyl 6A · FWD MPG 25 / 35Range 463 / 648 mi | 2.4L 4cyl 6A | FWD | 18.5 gal70 L | 25 / 35 | 463 / 648 mi | |
| Limited 4dr Sedan (built to 5/18) 2.4L 4cyl 6A · FWD MPG 25 / 35Range 463 / 648 mi | 2.4L 4cyl 6A | FWD | 18.5 gal70 L | 25 / 35 | 463 / 648 mi | |
| Limited SULEV 4dr Sedan 2.4L 4cyl 6A · FWD MPG 25 / 35Range 463 / 648 mi | 2.4L 4cyl 6A | FWD | 18.5 gal70 L | 25 / 35 | 463 / 648 mi | |
| Limited SULEV 4dr Sedan (built to 5/18) 2.4L 4cyl 6A · FWD MPG 25 / 35Range 463 / 648 mi | 2.4L 4cyl 6A | FWD | 18.5 gal70 L | 25 / 35 | 463 / 648 mi | |
| SE 4dr Sedan 2.4L 4cyl 6A · FWD MPG 25 / 36Range 463 / 666 mi | 2.4L 4cyl 6A | FWD | 18.5 gal70 L | 25 / 36 | 463 / 666 mi | |
| SE SULEV 4dr Sedan 2.4L 4cyl 6A · FWD MPG 25 / 36Range 463 / 666 mi | 2.4L 4cyl 6A | FWD | 18.5 gal70 L | 25 / 36 | 463 / 666 mi | |
| SEL 4dr Sedan (built to 5/18) 2.4L 4cyl 6A · FWD MPG 25 / 35Range 463 / 648 mi | 2.4L 4cyl 6A | FWD | 18.5 gal70 L | 25 / 35 | 463 / 648 mi | |
| SEL SULEV 4dr Sedan (built to 5/18) 2.4L 4cyl 6A · FWD MPG 25 / 35Range 463 / 648 mi | 2.4L 4cyl 6A | FWD | 18.5 gal70 L | 25 / 35 | 463 / 648 mi | |
| SEL+ 4dr Sedan 2.4L 4cyl 6A · FWD MPG 25 / 35Range 463 / 648 mi | 2.4L 4cyl 6A | FWD | 18.5 gal70 L | 25 / 35 | 463 / 648 mi | |
| SEL+ SULEV 4dr Sedan 2.4L 4cyl 6A · FWD MPG 25 / 35Range 463 / 648 mi | 2.4L 4cyl 6A | FWD | 18.5 gal70 L | 25 / 35 | 463 / 648 mi | |
| Sport 2.0T 4dr Sedan 2.0L 4cyl Turbo 8A · FWD MPG 23 / 32Range 426 / 592 mi | 2.0L 4cyl Turbo 8A | FWD | 18.5 gal70 L | 23 / 32 | 426 / 592 mi | |
| Sport 4dr Sedan (built to 5/18) 2.4L 4cyl 6A · FWD MPG 25 / 35Range 463 / 648 mi | 2.4L 4cyl 6A | FWD | 18.5 gal70 L | 25 / 35 | 463 / 648 mi | |
| Sport+ 4dr Sedan 2.4L 4cyl 6A · FWD MPG 25 / 35Range 463 / 648 mi | 2.4L 4cyl 6A | FWD | 18.5 gal70 L | 25 / 35 | 463 / 648 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 2018 Hyundai Sonata 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 28 MPG, a full 18.5-gallon tank covers about 518 miles.
| Gauge | Gallons | Highway miles | City miles |
|---|---|---|---|
| Full | 18.5 | 648 | 463 |
| 3/4 | 13.9 | 486 | 347 |
| 1/2 | 9.3 | 324 | 231 |
| 1/4 | 4.6 | 162 | 116 |
| 1/8 | 2.3 | 81 | 58 |
Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 536 gallons, roughly 29 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
- 26–31 MPG
- Tailpipe CO2
- 284–342 g/mi
- EPA greenhouse score
- 5–7 of 10
- Source
- EPA ratings ↗
What it costs to fill up a 2018 Hyundai Sonata
$78.99 to fill the 18.5-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 |
|---|---|---|---|---|
| 18.5 gal | Regular | $4.27 | $78.99 | $59.25 |
By region, 18.5-gallon tank
| Region | Regular / gal | Fill from empty |
|---|---|---|
| East Coast | $4.02 | $74.37 |
| Midwest | $4.27 | $78.99 |
| Gulf CoastLowest | $3.70 | $68.45 |
| Rocky Mountain | $4.46 | $82.51 |
| West Coast | $5.42 | $100.27 |
| CaliforniaHighest | $5.89 | $108.96 |
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
- 18.5-gallon tank$78.99
- A year of driving (15,000 mi)$2,287
Starts at the US average for regular; type in what your station charges. For other tank sizes, use the fill-up calculator.
Sonata tank size in other years
The 2018 Sonata uses the same 18.5 gal tank as every Sonata since 2011.
| Model year | Tank | Longest highway range |
|---|---|---|
| 2023 Sonata | 14.8–15.9 gal | 588 mi |
| 2022 Sonata | 14.8–15.9 gal | 588 mi |
| 2021 Sonata | 14.8–15.9 gal | 588 mi |
| 2020 Sonata | 14.8–15.9 gal | 588 mi |
| 2019 Sonata | 18.5 gal | 685 mi |
| 2018 Sonata | 18.5 gal | 685 mi |
| 2017 Sonata | 18.5 gal | 666 mi |
| 2016 Sonata | 18.5 gal | 703 mi |
| 2015 Sonata | 18.5 gal | 703 mi |
| 2014 Sonata | 18.5 gal | 648 mi |
| 2013 Sonata | 18.5 gal | 648 mi |
- 2026
- 2025
- 2024
- 2023
- 2022
- 2021
- 2020
- 2019
- 2018
- 2017
- 2016
- 2015
- 2014
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- 2012
- 2011
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- 2009
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2018 Hyundai Sonata vs similar 2018 sedans
The Sonata has the largest tank of the seven 2018 sedans compared here, 18.5 gallons against 18.5 for the Volkswagen Passat.
| 2018 model | Tank | Longest highway range |
|---|---|---|
| Hyundai Sonata | 18.5 gal | 685 mi |
| Volkswagen Passat | 18.5 gal | 666 mi |
| Kia Optima | 18.5 gal | 685 mi |
| Nissan Altima | 18.0 gal | 684 mi |
| Ford Fusion | 16.5–18.0 gal | 528 mi |
| Toyota Camry | 14.5–16.0 gal | 624 mi |
| Honda Accord | 14.8 gal | 562 mi |
Picked by body style and size: other 2018 sedans within about 5% of the Sonata's length and 15% of its curb weight, one model per brand.
2018 Hyundai Sonata fuel system recalls
None of the 1 recall NHTSA lists for the 2018 Hyundai Sonata involve the fuel system.
2018 Hyundai Sonata fuel pump and gauge parts
NHTSA lists no fuel-system recall for the 2018 Hyundai Sonata, 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 2018 Hyundai Sonata?
The 2018 Hyundai Sonata holds 18.5 gallons (70 liters) on every trim we list.
How many gallons and liters does the 2018 Hyundai Sonata gas tank hold?
The 2018 Hyundai Sonata tank holds 70 liters, or 18.5 gallons in US gallons.
How far can a 2018 Hyundai Sonata go on a full tank?
About 592–685 miles on the highway and 426–518 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 2018 Hyundai Sonata go on a quarter tank?
About 162 highway miles or 116 in town from the 18.5-gallon tank, which has roughly 4.6 gallons left at the quarter mark. Gauges aren't exact, so treat that as a guide.
What gas does the 2018 Hyundai Sonata take?
Regular unleaded. The label inside the fuel door confirms it for your car.
How much does it cost to fill up a 2018 Hyundai Sonata?
At the US average of $4.27 a gallon for regular (EIA, week of October 26, 2026), filling the 18.5-gallon tank from empty costs $78.99. It ranges from $68.45 in the Gulf Coast to $108.96 in California.
How much does a full tank of gas weigh in a 2018 Hyundai Sonata?
About 115 pounds for the 18.5-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.
Does the 2018 Hyundai Sonata have a bigger gas tank than the Honda Accord?
Yes. The 2018 Hyundai Sonata holds up to 18.5 gallons; the 2018 Honda Accord holds up to 14.8.
Has the 2018 Hyundai Sonata had a fuel pump or fuel system recall?
No. None of the 1 recall NHTSA lists for the 2018 Hyundai Sonata involve the fuel system.
Sources
- Tank sizes: manufacturer-rated capacities from US-market specifications, cross-checked against a second spec database. 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.
- Recalls: NHTSA recall database.
Does your owner's manual say something different? Let us know and we'll fix it. More on how we check the numbers.