27 MPG combined is a solid figure for the 2021 Kia K5 equipped with the 2.5L 4-cylinder engine. This isn’t a hybrid, and it’s not designed to be the hyper-miler of the mid-size sedan segment. Instead, the K5 balances respectable fuel economy with a healthy dose of style, technology, and value. It’s a car aimed at buyers who appreciate modern design and a comfortable driving experience but don’t prioritize squeezing every last mile from each gallon of fuel.

City and highway performance

The EPA estimates the K5 2.5L at 24 MPG in the city and 32 MPG on the highway. The city figure is reasonable; stop-and-go traffic will always impact fuel economy, and the non-hybrid K5 doesn’t have any electric assist to offset that. The 32 MPG highway number is achievable on long road trips but, as always, will vary depending on driving style and speed. Keep in mind that aggressive acceleration and high speeds will significantly impact your fuel consumption. The 8-speed automatic transmission (AM-S8) helps to keep the engine in its optimal range at higher speeds, contributing to the respectable highway number.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2021 Kia K5 2.5L at $1,600. This figure is based on driving 15,000 miles per year and using national average fuel prices. Of course, your actual fuel costs will vary based on your driving habits, the type of driving you do (city vs. highway), and the price of gasoline in your area.

If you drive less than 15,000 miles per year, or if gas prices are lower in your region, your annual fuel cost will be lower than $1,600. Conversely, if you drive more or live in an area with high gas prices, you can expect to pay more. This $1,600 estimate gives a good baseline for comparing the K5 to other vehicles in its class.

Real-world expectations

While the EPA estimates provide a useful benchmark, real-world fuel economy often differs. Drivers who frequently engage in spirited driving, heavy acceleration, or consistently exceed highway speed limits will likely see numbers closer to the low 20s. On the other hand, those who prioritize smooth acceleration, maintain consistent speeds, and use cruise control on the highway may achieve figures closer to, or even exceeding, the EPA estimates. Individual driving style and environmental conditions play a major role in any vehicle’s true fuel consumption.

How it compares

In the crowded mid-size sedan market, the K5 2.5L sits roughly in the middle of the pack in terms of fuel economy. A Toyota Camry LE with its standard 2.5L engine achieves an EPA-estimated 28 MPG combined, giving it a slight edge over the K5. The Honda Accord LX, also with a 1.5L turbo engine, delivers a comparable 30 MPG combined. A Mazda 6 with its base 2.5L engine gets around 29 MPG combined. These small differences might not be deal-breakers for most buyers, but it’s worth considering if fuel economy is a top priority.

If you’re interested in evaluating all Kia fuel economy data, we offer detailed vehicle comparisons. For detailed specifications, features and efficiency across model years, review the K5 MPG across all years.

Tips to maximize efficiency

Gentle acceleration is key to maximizing fuel economy in the K5 2.5L. Avoid aggressive starts and hard braking. Gradual acceleration allows the engine to operate more efficiently, minimizing fuel consumption. Anticipate traffic flow to avoid unnecessary stops and starts, further boosting your MPG.

Regular maintenance is essential for optimal fuel efficiency. Keep your tires properly inflated to the recommended pressure, as under-inflated tires create more rolling resistance and reduce MPG. Ensure that your air filter is clean, as a dirty air filter restricts airflow to the engine and reduces its efficiency. Regular oil changes with the correct type of oil also contribute to better fuel economy.

Minimize aerodynamic drag to improve highway fuel economy. Remove any unnecessary items from the roof rack or cargo area, as they can increase wind resistance and reduce MPG. Closing the windows and using the air conditioning can be more fuel-efficient at higher speeds than driving with the windows open, as open windows create significant drag.

Use the K5’s driving modes wisely. The “Eco” mode, if equipped, typically adjusts throttle response and transmission shift points to prioritize fuel efficiency. While it may slightly reduce performance, it can noticeably improve MPG in city driving. Experiment with different modes to find the best balance between performance and economy for your driving style.

Plan your trips strategically. Combine errands into fewer trips to minimize cold starts, which consume more fuel. Avoid peak traffic hours when possible, as stop-and-go traffic significantly reduces fuel economy. Using navigation apps to find the most efficient routes can also help you save fuel.