The 2015 Infiniti Q70 with the 3.7L V6 gets 21 MPG combined. It’s not atrocious, but this places the mid-size luxury sedan in a different category than a hybrid Lexus or a more modern turbocharged four-cylinder car. The Q70 3.7 appeals to someone who wants a smooth, naturally aspirated engine and traditional luxury over saving gas. They’re willing to pay more at the pump for the driving experience and the Infiniti brand.

City and highway performance

The EPA estimates 18 MPG in the city and 26 MPG on the highway. The city MPG is more relevant for most Q70 3.7 owners. This car isn’t lightweight, and stop-and-go driving takes its toll. The highway number is attainable by maintaining a steady speed without aggressive acceleration. The seven-speed automatic transmission tries to keep the engine optimal, but even with careful driving, the Q70 3.7 is at a disadvantage versus more fuel-conscious vehicles.

Annual fuel cost

The EPA calculates that the average 2015 Infiniti Q70 3.7 owner will spend around $2,750 per year on fuel. This is based on 15,000 miles annually, with city and highway driving, using the national average fuel price. Your actual fuel cost will vary based on your driving, fuel type, and gas prices.

Real-world expectations

EPA numbers are a baseline, but real-world fuel economy differs. Q70 3.7 owners often report numbers below the EPA estimates, especially in traffic or hills. Expect city MPG closer to 16-17, and highway numbers in the low 20s if you drive fast. Careful drivers can match or exceed the EPA estimates.

How it compares

The 2015 Infiniti Q70 3.7’s fuel economy is right in the middle of its class, which isn’t ideal. A 2015 BMW 535i, with its turbocharged 3.0L inline-six, gets around 24 MPG combined. A Lexus GS 350 gets a similar 23 MPG combined rating. The V8-powered Audi A6 3.0T, while using more gas in the city, can match the Q70’s highway MPG. For buyers prioritizing fuel costs, the Acura TLX with the 2.4L four-cylinder gets a better 28 MPG combined. The choice depends on whether the Q70’s luxury and performance justify more gas station visits. For more comparison data, check out Q70 MPG across all years.

Tips to maximize efficiency

Use the car’s “Eco” driving mode. This mode adjusts the throttle response and transmission mapping for better fuel efficiency. It might slightly reduce the car’s responsiveness, but it can make a difference in city driving.

Proper tire inflation is also critical. Underinflated tires increase rolling resistance, making the engine work harder. Check your tire pressures regularly and inflate them to the recommended levels on the driver’s side doorjamb. This maintenance task can improve fuel economy a few percent.

Avoid unnecessary idling. Running the engine while stopped wastes fuel. If you’re stopped for more than a minute, turn off the engine. Modern cars restart quickly, so there’s no need to idle.

Gentle acceleration and braking are key. Hard acceleration burns more fuel than gradual acceleration. Slamming on the brakes wastes energy. Anticipate traffic and drive smoothly to minimize fuel waste. Also, keep up with all the latest all Infiniti fuel economy data.

Finally, consider the weight. Remove any unnecessary items from the trunk and passenger compartment. Extra weight increases the engine’s workload. Every bit helps, especially over time.