The 2018 Kia Cadenza equipped with its 3.3L V6 gets 23 MPG combined. While not groundbreaking, this fuel economy is an acceptable compromise for buyers seeking a comfortable, well-equipped large sedan that prioritizes effortless power and a smooth ride over outright efficiency. It’s a traditional, full-size car designed for comfortable cruising, and its fuel economy reflects that mission. The Cadenza buyer isn’t pinching pennies at the pump; they’re prioritizing a quiet, refined driving experience without venturing into luxury brand price territory.

City and highway performance

The EPA estimates the 2018 Cadenza at 20 MPG in the city and 28 MPG on the highway. The city figure reflects the engine’s need to work harder in stop-and-go traffic, where its weight and larger displacement become more apparent. On the open road, however, the Cadenza settles into a comfortable cruise, and the 8-speed automatic transmission helps keep the engine at lower RPMs, contributing to the more favorable highway rating. These aren’t numbers that will win any awards, but for a naturally aspirated V6 powering a car of this size and delivering a composed ride for longer road trips, that 28 MPG is adequate.

Annual fuel cost

According to the EPA, the estimated annual fuel cost for the 2018 Kia Cadenza 3.3L V6 is $1,900. This figure is based on driving 15,000 miles per year, with a mix of city and highway driving, and using the national average fuel price. Actual fuel costs may vary depending on driving habits, the type of roads typically driven on, and local fuel prices. Consistent hard acceleration and frequent short trips will likely push that number higher, while prioritizing highway miles and gentle driving could bring it down somewhat. This is a benchmark but not necessarily a precise prediction of individual spending.

Real-world expectations

The EPA estimates provide a useful baseline, but remember that real-world fuel economy can differ. Some drivers report figures slightly below the EPA combined number, especially if their daily commute involves significant stop-and-go traffic. However, those who do more highway driving and practice fuel-efficient driving techniques often find it easier to match or even exceed the EPA’s 28 MPG highway estimate. The Cadenza’s onboard trip computer can be a valuable tool for monitoring fuel consumption and adjusting driving accordingly. Use it regularly to track progress and identify areas to improve efficiency.

How it compares

Compared to its competitors, the 2018 Kia Cadenza’s fuel economy is in line with other large sedans offering similar performance. For example, the Toyota Avalon, with its 3.5L V6, achieves an EPA-estimated 22 MPG combined. The Nissan Maxima, also using a 3.5L V6, manages slightly better at 25 MPG combined. The Chrysler 300, depending on the engine (V6 or V8), offers a range of fuel economy figures, the V6 version lands right around the Cadenza’s numbers. These comparisons are important for Cadenza buyers because they show that the Cadenza isn’t a fuel-economy outlier in its class. Those seeking significantly better MPG would need to consider smaller, less powerful sedans or explore hybrid options, sacrificing some of the Cadenza’s size and smooth power delivery.

For specific figures and cross-year comparisons, refer to CADENZA MPG across all years.

For a broader view, explore all Kia fuel economy data.

Tips to maximize efficiency

Use cruise control on the highway. The Cadenza’s adaptive cruise control system can help maintain a consistent speed, minimizing unnecessary acceleration and braking. This is especially effective on long, level stretches of road, where it can significantly improve fuel economy.

Avoid aggressive acceleration. The 3.3L V6 delivers ample power, but rapid acceleration consumes extra fuel. Gentle acceleration, especially from a standstill, helps keep the engine in its most efficient operating range. Treat the throttle with respect, and you’ll see positive results at the pump.

Ensure tires are properly inflated. Under-inflated tires increase rolling resistance, forcing the engine to work harder and burn more fuel. Check tire pressure regularly and inflate them to the recommended pressure, which can be found on the sticker inside the driver’s side door.

Minimize idling. Leaving the engine running while stationary consumes fuel without moving the car. If stopped for more than a minute, it’s generally more efficient to turn off the engine. Restarting uses less fuel than idling for an extended period.

Consider using the Cadenza’s “Eco” mode, if equipped. This mode generally adjusts the throttle response and transmission shift points to prioritize fuel economy. While it may slightly reduce performance, it can help to improve fuel efficiency, particularly in city driving.