Fuel Economy of the 2015 Infiniti Q50 3.7L

23 MPG combined is the fuel economy reality for owners of the 2015 Infiniti Q50a with the 3.7L V6. It’s a number that doesn’t top any efficiency charts, nor is it particularly embarrassing. The Q50a buyer prioritizes a blend of sporty driving feel, luxurious features, and distinctive styling, and accepts this trade-off for the performance and experience the car delivers. They aren’t shopping for Prius-level economy; they want a taste of Nissan/Infiniti’s legendary VQ engine family in a comfortably sized, well-equipped sedan.

City and highway performance

The EPA estimates the 2015 Q50a 3.7L at 20 MPG in the city and 29 MPG on the highway. The city figure reflects the engine’s thirst during stop-and-go traffic, a common scenario for many Q50a owners commuting in suburban or urban environments. The highway number, while respectable, likely requires a light foot and consistent speeds to achieve consistently. Real world highway results often dip below 29 MPG because many Q50a drivers enjoy spirited acceleration and passing maneuvers. The seven-speed automatic transmission is generally smooth, but isn’t geared primarily for hyper-miling. It prioritizes responsive shifts for a more engaging driving experience.

Annual fuel cost

The EPA calculates that the average owner of this 2015 Infiniti Q50a will spend approximately $2,500 per year on gasoline. This assumes 15,000 miles of driving annually, with a specific percentage split between city and highway miles, using prevailing national average fuel prices. Individual expenses may vary based on driving style, local fuel costs, and the actual number of miles driven each year. However, the $2,500 figure provides a standardized benchmark to compare the Q50a’s running costs against similar vehicles.

Real-world expectations

While the EPA estimates offer a baseline, real-world MPG can deviate significantly. Aggressive driving, frequent short trips, and extreme weather conditions can all negatively impact fuel economy. If you’re consistently engaging the Q50a’s sporty side, enjoying the reliable V6 power and quick acceleration, expect combined MPG figures closer to the lower end of the spectrum, possibly in the high teens or low 20s. On the other hand, a more conservative driver primarily using the car for highway cruising might achieve or even slightly exceed the EPA’s 29 MPG highway estimate. Also, remember to check for more Q50A MPG across all years to get a sense of trends.

How it compares

Compared to its competitors in the sporty luxury sedan segment, the 2015 Q50a 3.7L’s fuel economy sits squarely in the middle of the pack. A similarly equipped Acura TLX with its 3.5L V6 typically achieves around 21 MPG combined, a slight improvement, but with a less engaging driving experience for some. The BMW 328i (2.0L turbo four-cylinder) of the same era often exceeds 25 MPG combined, appealing to those prioritizing efficiency without completely sacrificing sporting intentions. Even the Audi A4 2.0T, a direct competitor, typically sees around 27 MPG combined. The Q50a buyer accepts the lower MPG, often prioritizing the V6 engine’s smooth power delivery and unique exhaust note over a few extra miles per gallon. You can browse all Infiniti fuel economy data to investigate other models.

Tips to maximize efficiency

The 2015 Infiniti Q50a 3.7L responds well to a smooth, consistent driving style. Avoid abrupt acceleration and hard braking, and try to anticipate traffic flow to maintain a steady speed. The VQ37VHR engine, while powerful, is sensitive to aggressive throttle inputs.

Regular maintenance is important for optimal fuel economy. Ensure that your Q50a’s tires are properly inflated, as underinflated tires increase rolling resistance and reduce MPG. Also, keep up with scheduled oil changes and air filter replacements to maintain engine efficiency.

When possible, use cruise control on highway stretches to maintain a consistent speed and avoid unintentional speed fluctuations. Even small speed variations can significantly impact fuel consumption over long distances.

Consider using the Q50a’s drive mode selector to choose a more fuel-efficient setting when performance isn’t the top priority. The “Standard” or “Eco” mode, if equipped, may adjust throttle response and transmission mapping to prioritize efficiency over acceleration. If you know the way you drive has a large impact, consider keeping a log of your driving style and the fuel economy results.