The Kia Optima’s fuel tank is typically 18.5 gallons (about 70 liters).
This article explains the standard capacity, how it translates into driving range, and how to verify the exact figure for your specific vehicle, including notes on how model year and market can affect the specification.
Standard capacity
Most U.S.-market Optima models share a fuel-tank capacity of 18.5 gallons (70 liters). This figure appears in Kia's spec sheets and in widely cited automotive references for the generation years 2011–2020 (and their immediate derivatives).
- 18.5 gallons (70 liters) — standard fuel-tank capacity on the vast majority of US-spec Kia Optima models across the 2011–2020 generation span.
Because small variations can occur by market, trim, or production run, always check the label on your car’s fuel door or the owner's manual for your exact figure.
Estimated driving range per tank
Actual range depends on engine choice, transmission, and driving conditions. With typical combined fuel economy in the high 20s to low 30s mpg, a full 18.5-gallon tank yields a practical range well above 500 miles in many situations.
- Roughly 500–600 miles per tank for many Optima configurations with a combined mpg around 28–32.
To maximize accuracy, use your vehicle’s trip computer or manual fuel-economy estimates with the exact mpg your driving pattern yields.
How to verify the exact tank size for your car
Because production years and markets can differ, confirm the precise capacity using official sources and your vehicle’s labeling.
- Check the owner's manual or the fuel-cap label for the stated capacity.
- Look for the sticker on the inside of the fuel-filler door or the trunk area that lists tank capacity.
- If in doubt, contact Kia customer service with your VIN for the exact specification.
The most reliable source is your car’s own labeling and documentation, which reflect the exact figure for your vehicle.
Summary
The Kia Optima generally comes with an 18.5-gallon (70-liter) fuel tank, providing a broad driving-range envelope across its model years. Always verify the exact number for your specific car using the owner's manual or official labels, especially if you own an export variant or a car from a different market.