The 2015 Infiniti Q70 5.6L gets 19 MPG combined. It’s a sedan that prioritizes strong V8 performance and a luxurious driving experience over saving gas. This isn’t a car for hypermilers, it’s for those who appreciate the quick response of 416 horsepower and the refined sound of a naturally aspirated engine, even if it means stopping for gas more often. The Q70 5.6L appeals to drivers who value traditional luxury and performance, often skipping the latest fuel-saving technologies for a more visceral experience.

City and highway performance

The EPA estimates for the 2015 Infiniti Q70 5.6L are 16 MPG in the city and 24 MPG on the highway. The lower city MPG happens because the engine works harder in stop-and-go traffic, especially with its responsive throttle. Highway driving, with the engine running at a more consistent speed, allows for the higher MPG figure, although aggressive passing will quickly erase any gains. The 7-speed automatic transmission is smooth and responsive.

The transmission includes a manual shift mode and Downshift Rev Matching, which blips the throttle on downshifts to smooth out gear changes. This contributes to a sportier driving experience, but these features encourage more aggressive driving which will lower your miles per gallon.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2015 Infiniti Q70 5.6L at $3,050. This figure is calculated based on driving 15,000 miles per year, using a mix of city and highway driving conditions, and factoring in national average fuel prices. Actual fuel costs will vary depending on how you drive, local fuel prices, and the specific ratio of city versus highway miles driven.

Drivers with a heavier foot or those who primarily drive in congested city environments can expect to exceed this $3,050 estimate, while more conservative drivers with longer highway commutes might see slightly lower costs. This cost shows the car’s positioning as a luxury performance sedan rather than an economy car.

Real-world expectations

The EPA provides a standardized estimate, but real-world MPG can vary significantly based on individual driving and conditions. Expect the Q70 5.6L to deliver figures close to the EPA estimates when driven conservatively. Frequent hard acceleration, using the Sport driving mode, or spending a majority of time in stop-and-go traffic will lower fuel economy. Those seeking better fuel efficiency within the Q70 lineup may consider exploring other engine options and you can find Q70 MPG across all years.

How it compares

The 2015 Infiniti Q70 5.6L’s fuel economy places it where you’d expect for luxury performance sedans. For example, the BMW 550i from the same year, equipped with a 4.4L V8, achieves an EPA-estimated 17 MPG city and 25 MPG highway, only slightly better. A comparable Mercedes-Benz E550 with its 4.7L V8 manages 18 MPG city and 25 MPG highway. The Audi A6 3.0T, with its supercharged V6, offers a better 20 MPG city and 30 MPG highway but lacks the power and sound of a V8. These comparisons are important to the Q70 5.6L buyer, who understands they’re sacrificing some efficiency for a more engaging driving experience.

For all Infiniti fuel economy data, see our make page.

Tips to maximize efficiency

Consistent and gentle acceleration is key to maximizing fuel efficiency. Avoid sudden bursts of speed and aim for smooth transitions between gears. The Q70’s V8 has plenty of torque, so you don’t need to accelerate hard to maintain momentum.

Check and maintain proper tire inflation. Underinflated tires increase rolling resistance, forcing the engine to work harder and consume more fuel. Check your tire pressure regularly and inflate them to the recommended levels.

Minimize idling. If you anticipate being stopped for more than a minute or two, turn off the engine. Modern engines are designed to restart efficiently, and excessive idling wastes fuel.

Anticipate traffic flow and maintain a safe following distance. Avoiding sudden braking and lane changes enhances safety and improves fuel economy by allowing the engine to operate more efficiently.

Regularly service your Q70 according to the manufacturer’s recommendations. This includes changing the engine oil, air filter, and spark plugs at the specified intervals. A well-maintained engine operates more efficiently, leading to better fuel economy.