20 MPG combined isn’t going to win any fuel economy awards, especially in the compact SUV segment. But for the 2015 Infiniti QX50 with its strong 3.7L V6, it’s a calculated trade-off. This isn’t a vehicle for those prioritizing Prius-like efficiency; instead, it appeals to buyers who value brisk acceleration and a responsive driving experience far more than squeezing every last mile from a gallon of premium fuel. They are willing to accept the V6’s thirst to get the extra punch.

City and highway performance

The EPA estimates for the 2015 QX50 peg city driving at 17 MPG and highway cruising at 25 MPG. The city figure is where most drivers will feel the sting, especially those in stop-and-go traffic. That V6 demands its fuel, and idling or creeping along in dense urban environments won’t do any favors to your wallet. The highway figure is more palatable, and reflects the engine’s ability to settle into a more efficient rhythm at steady speeds. However, aggressive passing or sustained high-speed driving will quickly diminish that 25 MPG figure. Cruise control can help on relatively flat stretches of highway. A driver’s style will largely determine where their actual fuel economy falls within (or even outside) those ranges. Remember to check QX50 MPG across all years to see other model year options.

Annual fuel cost

The EPA calculates the annual fuel cost for the 2015 Infiniti QX50 at $2,900. This figure is based on driving 15,000 miles per year, assuming a national average fuel price. It provides a benchmark for comparing the QX50’s fuel costs against other vehicles. Since the QX50 requires premium fuel, price fluctuations at the pump can significantly impact your real-world annual spending. However, if you drive fewer miles than the EPA’s average, that cost will be proportionately lower. High mileage drivers or those who live in areas with above-average premium fuel prices will quickly exceed that $2,900 estimate.

Real-world expectations

While the EPA’s estimates provide a useful baseline, real-world fuel economy for the 2015 QX50 can vary significantly based on driving style, traffic conditions, and even tire inflation. Owners who prioritize smooth acceleration and anticipate traffic flow can likely achieve numbers closer to the EPA estimates. However, those with a penchant for aggressive driving or who frequently find themselves stuck in congestion should expect lower fuel economy. Cold weather also impacts gas mileage, as colder temperatures reduce a battery’s capabilities.

How it compares

The 20 MPG combined puts the QX50 at a disadvantage compared to its rivals that emphasize fuel efficiency. For example, the Acura RDX with its standard V6 (comparable year) often achieves around 22 MPG combined, prioritizing efficiency while still delivering decent power. The Lexus NX 300h hybrid gets around 31 MPG combined, a far cry from a pure gasoline drivetrain. Even other SUVs of the same era like the BMW X3 xDrive28i with its turbocharged four-cylinder manages around 24 MPG combined. It is important to weigh the QX50’s sporty driving dynamics against the additional running costs when cross-shopping. See all Infiniti fuel economy data for other model options.

Tips to maximize efficiency

The QX50’s seven-speed automatic transmission has a manual shift mode that can be used to keep the engine in its most efficient range. Upshifting early and avoiding unnecessary downshifts can improve fuel economy, especially in city driving. Getting used to using this feature of the transmission can lead to better mileage.

Ensure your tires are properly inflated to the recommended pressure. Underinflated tires increase rolling resistance, which forces the engine to work harder and consume more fuel. Check your tire pressure regularly, especially during temperature changes, as fluctuations can affect pressure.

Avoid carrying unnecessary weight in the vehicle. The extra load will increase fuel consumption, particularly during acceleration and uphill climbs. Remove any items from the trunk or rear seats that aren’t essential for daily driving activities or needs.

Use cruise control on the highway whenever possible. Maintaining a consistent speed minimizes unnecessary acceleration and deceleration, which can significantly improve fuel economy. Also, try to anticipate traffic flow and maintain a reasonable following distance to avoid sudden braking, which wastes fuel and can frustrate other drivers.