2018 Hyundai Sonata Hybrid Gas Tank Size & Fuel Capacity
Fuel tank capacity
15.9gal · 60 L
The 2018 Hyundai Sonata Hybrid has a fuel tank capacity of 15.9 gallons (60 liters) on every trim.
A full tank is good for roughly 731 highway miles or 636 miles around town, going by the EPA ratings.
15.9 gal · Smaller than 69% of 2018 models we list.
Listed separately: 2018 Hyundai Sonata (18.5 gal).
- By trim
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2018 Hyundai Sonata Hybrid fuel tank capacity by trim
MPG and range are city / highway.
| Trim | Engine | Drive | Tank | MPG city / hwy | Range city / hwy | |
|---|---|---|---|---|---|---|
| Limited 4dr Sedan 2.0L 4cyl 6A · FWD Hybrid MPG 40 / 46Range 636 / 731 mi | 2.0L 4cyl 6A Hybrid | FWD | 15.9 gal60 L | 40 / 46 | 636 / 731 mi | |
| Limited w/Emerald Blue Interior 4dr Sedan 2.0L 4cyl 6A · FWD Hybrid MPG 40 / 46Range 636 / 731 mi | 2.0L 4cyl 6A Hybrid | FWD | 15.9 gal60 L | 40 / 46 | 636 / 731 mi | |
| SE 4dr Sedan 2.0L 4cyl 6A · FWD Hybrid MPG 40 / 46Range 636 / 731 mi | 2.0L 4cyl 6A Hybrid | FWD | 15.9 gal60 L | 40 / 46 | 636 / 731 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 Hybrid 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 42 MPG, a full 15.9-gallon tank covers about 668 miles.
| Gauge | Gallons | Highway miles | City miles |
|---|---|---|---|
| Full | 15.9 | 731 | 636 |
| 3/4 | 11.9 | 549 | 477 |
| 1/2 | 8.0 | 366 | 318 |
| 1/4 | 4.0 | 183 | 159 |
| 1/8 | 2.0 | 91 | 80 |
Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 357 gallons, roughly 22 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
- 42 MPG
- Tailpipe CO2
- 212 g/mi
- EPA greenhouse score
- 9 of 10
- Source
- EPA ratings
What it costs to fill up a 2018 Hyundai Sonata Hybrid
$67.89 to fill the 15.9-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 |
|---|---|---|---|---|
| 15.9 gal | Regular | $4.27 | $67.89 | $50.92 |
By region, 15.9-gallon tank
| Region | Regular / gal | Fill from empty |
|---|---|---|
| East Coast | $4.02 | $63.92 |
| Midwest | $4.27 | $67.89 |
| Gulf CoastLowest | $3.70 | $58.83 |
| Rocky Mountain | $4.46 | $70.91 |
| West Coast | $5.42 | $86.18 |
| CaliforniaHighest | $5.89 | $93.65 |
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
- 15.9-gallon tank$67.89
- A year of driving (15,000 mi)$1,525
Starts at the US average for regular; type in what your station charges. For other tank sizes, use the fill-up calculator.
Sonata Hybrid tank size in other years
The 2018 Sonata Hybrid uses the same 15.9 gal tank as every Sonata Hybrid since 2016.
| Model year | Tank | Longest highway range |
|---|---|---|
| 2023 Sonata Hybrid | 13.2 gal | 713 mi |
| 2022 Sonata Hybrid | 13.2 gal | 713 mi |
| 2021 Sonata Hybrid | 13.2 gal | 713 mi |
| 2020 Sonata Hybrid | 13.2 gal | 713 mi |
| 2019 Sonata Hybrid | 15.9 gal | 731 mi |
| 2018 Sonata Hybrid | 15.9 gal | 731 mi |
| 2017 Sonata Hybrid | 15.9 gal | 716 mi |
| 2016 Sonata Hybrid | 15.9 gal | 700 mi |
| 2015 Sonata Hybrid | 17.2 gal | 688 mi |
| 2014 Sonata Hybrid | 17.2 gal | 688 mi |
| 2013 Sonata Hybrid | 17.2 gal | 688 mi |
2018 Hyundai Sonata Hybrid vs similar 2018 sedans
At 15.9 gallons, the Sonata Hybrid's largest tank ranks fifth of the seven 2018 sedans compared here. The Volkswagen Passat carries the most (18.5 gal) and the Toyota Camry Hybrid the least (13.0 gal).
| 2018 model | Tank | Longest highway range |
|---|---|---|
| Volkswagen Passat | 18.5 gal | 666 mi |
| Ford Fusion | 16.5–18.0 gal | 528 mi |
| Mazda 6 | 16.4 gal | 574 mi |
| Buick LaCrosse | 15.8–16.2 gal | 553 mi |
| Hyundai Sonata Hybrid | 15.9 gal | 731 mi |
| Kia Optima Hybrid | 15.9 gal | 731 mi |
| Toyota Camry Hybrid | 13.0 gal | 689 mi |
Other 2018 sedans of a similar size, one model per brand.
2018 Hyundai Sonata Hybrid fuel system recalls
None of the 1 recall NHTSA lists for the 2018 Hyundai Sonata Hybrid involve the fuel system.
Frequently asked questions
What is the fuel tank capacity of the 2018 Hyundai Sonata Hybrid?
The 2018 Hyundai Sonata Hybrid holds 15.9 gallons (60 liters) on every trim we list.
How many gallons and liters does the 2018 Hyundai Sonata Hybrid gas tank hold?
The 2018 Hyundai Sonata Hybrid tank holds 60 liters, or 15.9 gallons in US gallons.
How far can a 2018 Hyundai Sonata Hybrid go on a full tank?
About 731 miles on the highway and 636 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 Hybrid go on a quarter tank?
About 183 highway miles or 159 in town from the 15.9-gallon tank, which has roughly 4.0 gallons left at the quarter mark. Gauges aren't exact, so treat that as a guide.
What gas does the 2018 Hyundai Sonata Hybrid 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 Hybrid?
At the US average of $4.27 a gallon for regular (EIA, week of October 26, 2026), filling the 15.9-gallon tank from empty costs $67.89. It ranges from $58.83 in the Gulf Coast to $93.65 in California.
How much does a full tank of gas weigh in a 2018 Hyundai Sonata Hybrid?
About 99 pounds for the 15.9-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.
Does the 2018 Hyundai Sonata Hybrid have a bigger gas tank than the Kia Optima Hybrid?
No, they match: both top out at 15.9 gallons in 2018.
Has the 2018 Hyundai Sonata Hybrid had a fuel pump or fuel system recall?
No. None of the 1 recall NHTSA lists for the 2018 Hyundai Sonata Hybrid 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 (Hyundai 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.