23 MPG combined might not sound exciting in 2018, but for a three-row SUV with all-wheel drive, it’s a respectable number. The Mazda CX-9 4WD with its 2.5L turbocharged engine is built for families who need the extra space and all-weather assurance. These buyers will likely find a mid-20s MPG an acceptable trade-off for its other appealing qualities.

City and highway performance

The EPA estimates for the 2018 Mazda CX-9 4WD aren’t drastically different between city and highway driving. The city MPG is rated at 20, while the highway comes in at 26. This relatively narrow spread indicates that the CX-9’s turbocharged 2.5L engine and six-speed automatic transmission operate efficiently across a range of driving conditions. Unlike some larger SUVs that suffer a significant MPG drop in stop-and-go traffic, the CX-9’s smaller engine and turbocharging seem to reduce the typical fuel economy penalty. This also shows Mazda’s engineering philosophy of optimizing real-world drivability over chasing headline-grabbing numbers, prioritizing a responsive and engaging driving experience.

Annual fuel cost

The EPA calculates the annual fuel cost for the 2018 Mazda CX-9 4WD at $1,900. This figure is based on driving 15,000 miles per year and using national average fuel prices. Individual fuel costs will obviously vary depending on driving habits and local fuel prices, but this $1,900 estimate provides a useful benchmark for comparing the CX-9’s operating expenses against other vehicles in its class. For families on a budget, understanding this annual fuel cost is an important part of the ownership equation. You can explore all Mazda fuel economy data on our site to see how the CX-9 compares against other models in the lineup.

Real-world expectations

While the EPA estimates provide a standardized baseline, real-world fuel economy can deviate depending on several factors, particularly how and where the vehicle is driven. Owners who frequently haul heavy loads or drive aggressively can expect to see MPG numbers lower than the official ratings. Those who prioritize smooth acceleration, anticipate traffic, and maintain consistent speeds may achieve figures closer to, or even slightly better than, the EPA’s 23 MPG combined. The CX-9’s turbocharger is a key factor: too much boost equals poor fuel economy. Given that the CX-9 is often used for family duties, including school runs and long trips, it’s safe to say that most owners may find themselves around the 22-24 MPG range in mixed driving conditions. More data on CX 9 MPG across all years can reveal trends.

How it compares

In the competitive three-row SUV segment, the 2018 Mazda CX-9 4WD holds its own in terms of fuel economy, even if it doesn’t lead the pack. A 2018 Honda Pilot 4WD, for example, lands in a similar MPG range at 19 city / 27 highway / 22 combined. The Nissan Pathfinder 4WD from the same year is rated at 19 city / 26 highway / 22 combined. These numbers highlight that most SUVs with AWD and this much interior space offer largely similar fuel economy numbers. Hybrids like the Toyota Highlander Hybrid (rated around 29 MPG combined) offer a significant improvement, but also come with a different driving experience and potentially higher purchase price. The CX-9 buyer likely prioritizes driving dynamics almost equally with fuel economy, and that consideration sets this vehicle apart from many competitors.

Tips to maximize efficiency

The Mazda CX-9 responds well to a gentle driving style. Avoid excessive acceleration and hard braking, as these actions demand more fuel. The turbocharged engine is readily responsive, so careful throttle management will help keep you out of the boost and in its most efficient operating range.

Regular maintenance, particularly keeping tires properly inflated, can have a noticeable impact on fuel economy. Underinflated tires create more rolling resistance, requiring the engine to work harder and consume more fuel. Check your CX-9’s recommended tire pressure (found on the driver’s side doorjamb) and ensure your tires are within that range.

Reduce unnecessary weight inside the vehicle. Carrying around excess cargo adds load, which directly affects fuel consumption. Lightening the load even by a couple hundred pounds can amount to a measurable improvement.

Use cruise control on the highway to maintain a consistent speed and avoid unintended surges in acceleration. This is particularly effective on flat stretches of road where the system can hold a steady throttle position. For hills, be extra observant and use cruise control carefully.