18 MPG combined is what you can expect from a 2019 Infiniti Q70 with the 5.6L V8 and all-wheel drive. This isn’t a car bought for its fuel efficiency. It’s a car bought for its smooth, strong engine, luxurious features, and distinctive style. Fuel economy is a secondary consideration, tolerated rather than celebrated by its affluent owners.

City and highway performance

The EPA estimates the Q70 AWD 5.6L at 16 MPG in the city and 23 MPG on the highway. These figures accurately reflect the engine’s nature. In stop-and-go urban driving, the large displacement V8 requires a lot of fuel, resulting in predictably low city MPG. On the open road, with the transmission settled into its highest gear and the engine at low RPM, the highway figure becomes more acceptable, though still far from class-leading. The automatic transmission, with its seven gears, does its best to optimize fuel consumption, but is ultimately battling against the engine’s inherent characteristics.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2019 Infiniti Q70 AWD 5.6L at $3,200. This figure is based on driving 15,000 miles per year and using national average fuel prices. Keep in mind that premium fuel is recommended for this engine, further increasing the cost of ownership. This significant outlay highlights the trade-off buyers make when choosing rewarding performance over outright efficiency. Many are happily willing to spend that amount for the driving experience the Q70 delivers.

Real-world expectations

While EPA estimates provide a baseline, real-world fuel economy can vary depending on driving habits, traffic conditions, and even weather. Expect the actual MPG gauge to fluctuate, especially in mixed driving. Aggressive acceleration and frequent hard stops will significantly reduce fuel economy.

Prolonged idling in traffic will also decrease the average. Smooth driving techniques and consistent highway speeds will bring the MPG closer to the EPA estimates. Owners who are conscientious can see slightly better numbers, but don’t expect miracles from a large-displacement V8.

How it compares

Compared to other luxury sedans with similar performance, the Q70’s fuel economy is what you might expect. A BMW 550i xDrive, with its turbocharged V8, is rated at 17 MPG city and 25 MPG highway, slightly better on the highway but similar around town. A Mercedes-Benz E550 4MATIC Coupe boasts EPA-estimated numbers of 17 city and 26 highway when new. A Lexus GS 350 AWD, while offering a V6 instead of a V8, manages 19 MPG city and 26 MPG highway, clearly demonstrating the fuel-saving benefits of a smaller engine, even with a tradeoff in power. Browsing Q70 MPG across all years reveals consistency reflecting the enduring engine architecture. Ultimately, the Q70 buyer prioritizes the V8 experience and is willing to accept the associated fuel costs, rather than opting for a more fuel-efficient alternative from a competitor whose model may have better EPA numbers.

Tips to maximize efficiency

Practice smooth acceleration and braking. The Q70’s throttle is responsive, and requires a gentle touch to avoid excessive fuel consumption. Anticipate traffic flow to minimize hard stops, and let the car coast when possible.

Maintain proper tire inflation. Underinflated tires increase rolling resistance, which directly impacts fuel economy. Check your tire pressure regularly and inflate them to the recommended levels found on the sticker inside the driver’s side door. This small step can make a noticeable difference.

Minimize idling. Modern engines are surprisingly efficient when running, but extended idling burns fuel without covering any distance. If you anticipate being stopped for more than a minute or two, it’s better to turn off the engine.

Consider using the drive mode selector. While likely not a drastic change, using the “Eco” setting could mellow out throttle response which, when coupled with more gentle driving habits, will provide a small increase MPG. See all Infiniti fuel economy data for more.

Be diligent about routine maintenance. A well-maintained engine runs more efficiently. Follow the manufacturer’s recommended service schedule, including oil changes, air filter replacements, and spark plug maintenance. Small inefficiencies can add up over time.