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 2023 Kia K5 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 31 MPG, a full 15.8-gallon tank covers about 490 miles.
Gauge
Gallons
Highway miles
City miles
Full
15.8
585
427
3/4
11.9
438
320
1/2
7.9
292
213
1/4
4.0
146
107
1/8
2.0
73
53
Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 484 gallons, roughly 31 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.
At 15.8 gallons, the K5's largest tank ranks second of the four 2023 sedans compared here. The Hyundai Sonata carries the most (15.9 gal) and the Volkswagen Jetta GLI the least (13.2 gal).
Other 2023 sedans of a similar size, one model per brand.
2023 Kia K5 fuel system recalls
NHTSA lists 1 fuel-system recall for the 2023 Kia K5, out of 4 recalls in total. A recall applies only to the vehicles named in it, so check your VIN.
Fuel systemNov 17, 2025 · NHTSA 25V794000 · Kia America, Inc. · 250,547 vehicles
Kia America, Inc. (Kia) is recalling certain 2021-2024 K5 vehicles. A damaged check valve can allow air to enter the fuel tank, causing it to expand and contact hot exhaust components, melting the tank.
Risk and remedy
Risk: A melted fuel tank can leak, increasing the risk of a fire.
Remedy: Dealers will replace the check valve. The fuel tank will be inspected for damage and replaced as necessary. All repairs will be performed free of charge. Owner notification letters were mailed January 16, 2026. Owners may contact Kia customer service at 800-333-4542. Kia's number for this recall is SC356. Vehicle Identification Numbers (VINs) involved in this recall will be searchable on NHTSA.gov beginning December 1, 2025.
What is the fuel tank capacity of the 2023 Kia K5?
The 2023 Kia K5 holds 15.8 gallons (60 liters) on every trim we list.
How many gallons and liters does the 2023 Kia K5 gas tank hold?
The 2023 Kia K5 tank holds 60 liters, or 15.8 gallons in US gallons.
Does AWD change the 2023 Kia K5 gas tank?
No. FWD and AWD versions of the 2023 Kia K5 use the same 15.8 gal tank.
How far can a 2023 Kia K5 go on a full tank?
About 506–585 miles on the highway and 379–427 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 2023 Kia K5 go on a quarter tank?
About 146 highway miles or 107 in town from the 15.8-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 2023 Kia K5 take?
Regular unleaded. The label inside the fuel door confirms it for your car.
How much does it cost to fill up a 2023 Kia K5?
At the US average of $4.27 a gallon for regular (EIA, week of October 26, 2026), filling the 15.8-gallon tank from empty costs $67.47. It ranges from $58.46 in the Gulf Coast to $93.06 in California.
How much does a full tank of gas weigh in a 2023 Kia K5?
About 98 pounds for the 15.8-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.
Does the 2023 Kia K5 have a bigger gas tank than the Hyundai Sonata?
No. The 2023 Hyundai Sonata holds up to 15.9 gallons; the 2023 Kia K5 holds up to 15.8.
Has the 2023 Kia K5 had a fuel pump or fuel system recall?
Yes. NHTSA lists 1 fuel-system recall for the 2023 Kia K5: 25V794000 (fuel system). 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).