2018 Hyundai Ioniq Plug-In Hybrid Gas Tank Size & Fuel Capacity
Fuel tank capacity
11.4gal · 43 L
The 2018 Hyundai Ioniq Plug-In Hybrid has a fuel tank capacity of 11.4 gallons (43 liters) on every trim.
A full tank is good for roughly 593 highway miles or 604 miles around town, going by the EPA ratings.
11.4 gal · Smaller than 95% of 2018 models we list.
- By trim
- Gas cap & parts
- Fuel essentials
- Miles per tank
- Fill-up cost
- Other years
- Compared
- Fuel recalls
- FAQ
2018 Hyundai Ioniq Plug-In Hybrid fuel tank capacity by trim
MPG and range are city / highway.
| Trim | Engine | Drive | Tank | MPG city / hwy | Range city / hwy | |
|---|---|---|---|---|---|---|
| 4dr Hatchback 1.6L 4cyl 6AM · FWD Plug-in hybrid MPG 53 / 52Range 604 / 593 mi | 1.6L 4cyl 6AM Plug-in hybrid | FWD | 11.4 gal43 L | 53 / 52 | 604 / 593 mi | |
| Limited 4dr Hatchback 1.6L 4cyl 6AM · FWD Plug-in hybrid MPG 53 / 52Range 604 / 593 mi | 1.6L 4cyl 6AM Plug-in hybrid | FWD | 11.4 gal43 L | 53 / 52 | 604 / 593 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 Ioniq Plug-In 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 52 MPG, a full 11.4-gallon tank covers about 593 miles.
| Gauge | Gallons | Highway miles | City miles |
|---|---|---|---|
| Full | 11.4 | 593 | 604 |
| 3/4 | 8.6 | 445 | 453 |
| 1/2 | 5.7 | 296 | 302 |
| 1/4 | 2.9 | 148 | 151 |
| 1/8 | 1.4 | 74 | 76 |
Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 288 gallons, roughly 25 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
- 52 MPG
- Tailpipe CO2
- 75 g/mi
- EPA greenhouse score
- 10 of 10
- Source
- EPA ratings
What it costs to fill up a 2018 Hyundai Ioniq Plug-In Hybrid
$48.68 to fill the 11.4-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 |
|---|---|---|---|---|
| 11.4 gal | Regular | $4.27 | $48.68 | $36.51 |
By region, 11.4-gallon tank
| Region | Regular / gal | Fill from empty |
|---|---|---|
| East Coast | $4.02 | $45.83 |
| Midwest | $4.27 | $48.68 |
| Gulf CoastLowest | $3.70 | $42.18 |
| Rocky Mountain | $4.46 | $50.84 |
| West Coast | $5.42 | $61.79 |
| CaliforniaHighest | $5.89 | $67.15 |
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
- 11.4-gallon tank$48.68
- A year of driving (15,000 mi)$1,232
Starts at the US average for regular; type in what your station charges. For other tank sizes, use the fill-up calculator.
Ioniq Plug-In Hybrid tank size in other years
2018 is the first Ioniq Plug-In Hybrid model year we list.
| Model year | Tank | Longest highway range |
|---|---|---|
| 2022 Ioniq Plug-In Hybrid | 11.4 gal | 581 mi |
| 2021 Ioniq Plug-In Hybrid | 11.4 gal | 581 mi |
| 2020 Ioniq Plug-In Hybrid | 11.4 gal | 581 mi |
| 2019 Ioniq Plug-In Hybrid | 11.4 gal | 593 mi |
| 2018 Ioniq Plug-In Hybrid | 11.4 gal | 593 mi |
2018 Hyundai Ioniq Plug-In Hybrid vs similar 2018 hatchbacks
At 11.4 gallons, the Ioniq Plug-In Hybrid's largest tank ranks fourth of the five 2018 hatchbacks compared here. The MINI Clubman carries the most (13.2 gal) and the Toyota Prius Prime the least (11.3 gal).
| 2018 model | Tank | Longest highway range |
|---|---|---|
| MINI Clubman | 13.2 gal | 449 mi |
| Kia Forte | 13.2 gal | 488 mi |
| Ford Focus ST | 12.4 gal | 372 mi |
| Hyundai Ioniq Plug-In Hybrid | 11.4 gal | 593 mi |
| Toyota Prius Prime | 11.3 gal | 599 mi |
Other 2018 hatchbacks of a similar size, one model per brand.
2018 Hyundai Ioniq Plug-In Hybrid fuel system recalls
None of the 1 recall NHTSA lists for the 2018 Hyundai Ioniq Plug-In Hybrid involve the fuel system.
Frequently asked questions
What is the fuel tank capacity of the 2018 Hyundai Ioniq Plug-In Hybrid?
The 2018 Hyundai Ioniq Plug-In Hybrid holds 11.4 gallons (43 liters) on every trim we list.
How many gallons and liters does the 2018 Hyundai Ioniq Plug-In Hybrid gas tank hold?
The 2018 Hyundai Ioniq Plug-In Hybrid tank holds 43 liters, or 11.4 gallons in US gallons.
How far can a 2018 Hyundai Ioniq Plug-In Hybrid go on a full tank?
About 593 miles on the highway and 604 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 Ioniq Plug-In Hybrid go on a quarter tank?
About 148 highway miles or 151 in town from the 11.4-gallon tank, which has roughly 2.9 gallons left at the quarter mark. Gauges aren't exact, so treat that as a guide.
What gas does the 2018 Hyundai Ioniq Plug-In 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 Ioniq Plug-In Hybrid?
At the US average of $4.27 a gallon for regular (EIA, week of October 26, 2026), filling the 11.4-gallon tank from empty costs $48.68. It ranges from $42.18 in the Gulf Coast to $67.15 in California.
How much does a full tank of gas weigh in a 2018 Hyundai Ioniq Plug-In Hybrid?
About 71 pounds for the 11.4-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.
Does the 2018 Hyundai Ioniq Plug-In Hybrid have a bigger gas tank than the Toyota Prius Prime?
Yes. The 2018 Hyundai Ioniq Plug-In Hybrid holds up to 11.4 gallons; the 2018 Toyota Prius Prime holds up to 11.3.
Has the 2018 Hyundai Ioniq Plug-In Hybrid had a fuel pump or fuel system recall?
No. None of the 1 recall NHTSA lists for the 2018 Hyundai Ioniq Plug-In 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.