The Kia Optima does 29.3 mpg combined (26.5 city, 33.8 highway), which works out to about $1,311 a year in fuel at $3.20 a gallon and 12,000 miles. Engine choice matters more than you'd think: 2L 4-cyl Hybrid does 41.8 mpg while 2.5L 6-cyl does 21 — a difference of $910 a year. Against other 4-cyl cars it sits above the average of 25.7 mpg.
Every Kia Optima engine, compared
Gas mileage on the Kia Optima ranges from 41.8 down to 21 depending on which engine sits under the bonnet — a spread of $910 a year across 7 versions of the same car. Picking the right one often saves more fuel than picking a different car altogether. Yearly cost assumes 12,000 miles at $3.20 a gallon.
| Engine | Combined | City / Highway | Years | Fuel per year |
|---|---|---|---|---|
| 2L 4-cyl Hybrid | 39.3 / 45.5 | 2017–2020 | $919 | |
| 2L 4-cyl Plug-in hybrid | 38.3 / 43.3 | 2017–2020 | $953 | |
| 2.4L 4-cyl Hybrid | 34.7 / 38 | 2011–2016 | $1,046 | |
| 1.6L 4-cyl | 27.6 / 37 | 2016–2020 | $1,239 | |
| 2.4L 4-cyl | 21.5 / 30.5 | 2001–2015 | $1,561 | |
| 2.7L 6-cyl | 19 / 26.4 | 2002–2010 | $1,753 | |
| 2.5L 6-cyl | 18 / 24 | 2001–2001 | $1,829 |
What that actually costs
The Kia Optima burns a gallon every 29.3 miles, so 12,000 miles takes about 410 gallons a year. At $3.20 that is what the table below adds up to.
| Measure | Value |
|---|---|
| Cost per mile | $0.109 |
| Fuel per year | $1,311 |
| Fuel over five years | $6,555 |
| Against other 4-cyl cars | −$183 a year |
| EPA's own estimate | $2,256 a year |
City or highway — who is this car for
The Kia Optima gives up 7.3 mpg the moment you leave the motorway — 33.8 out there against 26.5 in town, a 28% drop worth $313 a year. A wide gap punishes stop-and-start traffic; a narrow one means the car doesn't care where you drive it.
| Measure | Value | Reading |
|---|---|---|
| City | 26.5 mpg | $1,449 a year if you only drive in town |
| Highway | 33.8 mpg | $1,136 a year if you mostly commute |
| Gap | +7.3 mpg (28%) | Typical for its type |
How the Optima changed over the years
The Optima peaked in 2020 at 38 mpg (35.3 city, 42 highway) and was at its thirstiest in 2002 at 20 — 18 mpg apart, or $909 a year in fuel between buying one year and the other. The 2020 car does 38. Jumps usually mark a new generation or a new engine; dips often mean a heavier body or added all-wheel drive.
| Model year | Combined | City / Highway | Engines offered | Fuel per year |
|---|---|---|---|---|
| 2020 | 35.3 / 42 | 3 | $1,011 | |
| 2019 | 34.7 / 41.7 | 3 | $1,029 | |
| 2018 | 35 / 42 | 3 | $1,019 | |
| 2017 | 35 / 42 | 3 | $1,019 | |
| 2016 | 31.5 / 37.5 | 2 | $1,129 | |
| 2015 | 29 / 35.5 | 2 | $1,219 | |
| 2014 | 29 / 35.5 | 2 | $1,219 | |
| 2013 | 29.5 / 36 | 2 | $1,200 | |
| 2012 | 29 / 36 | 2 | $1,219 | |
| 2011 | 28.5 / 35.5 | 2 | $1,219 | |
| 2010 | 21 / 30 | 2 | $1,600 | |
| 2009 | 21 / 30 | 2 | $1,600 | |
| 2008 | 20.5 / 29.5 | 2 | $1,600 | |
| 2007 | 20.5 / 29.5 | 2 | $1,600 | |
| 2006 | 20.5 / 29.5 | 2 | $1,600 | |
| 2005 | 19 / 26 | 2 | $1,745 | |
| 2004 | 19 / 26 | 2 | $1,745 | |
| 2003 | 19 / 26 | 2 | $1,745 | |
| 2002 | 18 / 24.5 | 2 | $1,920 | |
| 2001 | 18.5 / 25 | 2 | $1,829 |
MPG is a number. Dollars per year is the answer.
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How we count
This page rests on 44 EPA ratings of the Kia Optima — 7 engines across 2001–2020. The mileage is EPA's laboratory figure, unchanged; the yearly bill is ours, at 12,000 miles and $3.20 a gallon, against EPA's own estimate of $2,256. Full method.
Frequently asked questions
What mpg does the Kia Optima get?
29.3 mpg combined on average — 26.5 in the city and 33.8 on the highway, per EPA ratings across 2001–2020.
How much does a Kia Optima cost in fuel per year?
About $1,311 at 12,000 miles and $3.20 a gallon — roughly $6,555 over five years, or 0.109 dollars a mile.
Which Optima engine is the most economical?
The 2L 4-cyl Hybrid at 41.8 mpg, against 21 for the 2.5L 6-cyl — a difference of about $910 a year.
Is the Optima good on fuel compared with similar cars?
Against other 4-cyl cars it sits above the average of 25.7 mpg, computed across 4765 ratings.
Are these real-world Optima figures?
No — they are EPA laboratory ratings, the same ones printed on the window sticker, and EPA's own annual fuel estimate for the Kia Optima is $2,256 against the $1,311 we compute at 12,000 miles. Expect a little worse in practice: the spread between the 42 and 19 mpg versions of this car is smaller than the spread between two drivers of the same one.
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