The 2018 Infiniti Q70 3.7L six-cylinder achieves 21 MPG combined, a figure that will neither excite nor dissuade the specific buyer this car targets. They are seeking a comfortable, stylish, and relatively discrete luxury sedan with a proven V6 engine, and they accept that extreme fuel efficiency is not part of the equation.

City and highway performance

The EPA estimates the 2018 Infiniti Q70 3.7L will return 18 MPG in city driving and 25 MPG on the highway. The relatively wide gap between city and highway figures suggests the powertrain is more comfortable at a steady cruise than it is in stop-and-go traffic. The seven-speed automatic transmission operates smoothly, but in the city, it contributes to fuel consumption as it cycles through gears more frequently. On the open road, the Q70 settles into a relaxed rhythm, allowing it to achieve its stated highway MPG. Drivers prioritizing fuel economy should prioritize carefully planned longer journeys.

Annual fuel cost

According to the EPA, the annual fuel cost for the 2018 Infiniti Q70 3.7L is $2,750. This estimate is based on driving 15,000 miles per year and using national average fuel prices. It’s a useful benchmark, but your individual fuel costs will vary depending on your driving habits, the type of driving you do (city versus highway), and the actual price of fuel in your area. If you primarily drive in the city or have a heavier foot, expect to exceed this figure. And this does not account for premium fuel.

Real-world expectations

While the EPA estimates provide a standardized baseline, real-world fuel economy can often differ. Variables such as aggressive acceleration, frequent braking, and even tire pressure can impact your fuel consumption. Passengers and cargo will also play a role. Owners who prioritize smooth, consistent driving and adhere to recommended maintenance schedules are more likely to achieve figures closer to the EPA estimates. Exploring Q70 MPG across all years may offer additional insight from other owners.

How it compares

In the mid-size luxury sedan segment, the 2018 Infiniti Q70 3.7L’s fuel economy is about what you’d expect. The Lexus GS 350, for example, is rated at 23 MPG combined, a slight advantage. The BMW 540i, with its turbocharged inline-six, achieves 24 MPG combined, offering not only better fuel economy but also considerably more thrust. The Acura RLX, a less obvious competitor, manages only 20 MPG combined despite including a hybrid powertrain in its lineup. For the Q70 buyer, outright fuel efficiency isn’t the primary concern, but staying competitive with the other options is important. For example, they likely are not considering the V8-powered Q70 5.6, which nets only 19 MPG combined but dramatically increases both vehicle and fuel costs.

Tips to maximize efficiency

Gentle acceleration can significantly improve fuel economy in the Q70 3.7L. The V6 engine delivers ample power, but abrupt acceleration burns unnecessary fuel. Gradually ease into the throttle to minimize fuel consumption and maintain a smoother driving experience.

Tire pressure plays an important role in fuel efficiency. Ensure your tires are inflated to the recommended pressure level, which can be found on the driver’s side doorjamb. Underinflated tires increase rolling resistance, leading to decreased fuel economy. Regularly checking and maintaining proper tire pressure is a simple way to save gas.

Minimize idling time whenever possible. If you anticipate stopping for more than a minute, turn off the engine. Excessive idling consumes fuel without moving the vehicle. This is especially relevant for city dwellers who frequently encounter stop-and-go traffic.

Consider using cruise control on the highway. Maintaining a consistent speed can help optimize fuel consumption. Cruise control minimizes unnecessary acceleration and deceleration, resulting in a more efficient highway driving experience. Set it and forget it (responsibly).

Regular maintenance, including oil changes and air filter replacements, will keep your Q70’s engine running efficiently. A well-maintained engine operates more smoothly and consumes less fuel. Consult your owner’s manual for recommended maintenance intervals. You can also browse all Infiniti fuel economy data on our site.