16 MPG combined won’t get the 2015 Infiniti QX80 2WD 5.6L any green awards, but it doesn’t have to. This is a 5,600-pound vehicle designed to easily transport up to eight passengers and all their belongings in comfort. Fuel economy, while not irrelevant, is less important for the QX80 buyer than ample space, a commanding driving position, and the strong power of its V8 engine.

City and highway performance

The EPA estimates for the 2015 QX80 2WD are 14 MPG in the city and 20 MPG on the highway. The city figure reflects the demands of stop-and-go traffic and the engine’s need to work harder to move its weight from a standstill. The highway number, while seemingly low by modern standards, is more achievable in real-world conditions when the QX80 can settle into a comfortable cruise, using its seven-speed automatic transmission to keep the engine in its most efficient range.

However, aggressive acceleration and high speeds will quickly reduce those highway gains. The standard engine is a 5.6L 8-cyl.

Annual fuel cost

The EPA calculates the annual fuel cost for the 2015 Infiniti QX80 2WD at $3,600. This figure is based on driving 15,000 miles per year, with a mix of city and highway driving, using national average fuel prices. It’s a useful benchmark for comparing the QX80’s fuel expenses against other vehicles, but individual costs will vary depending on driving habits, location, and fluctuating gas prices. A driver who frequently tows or spends most of their time in congested urban environments will likely exceed this annual estimate.

Real-world expectations

While the EPA provides a standardized rating, real-world fuel economy for the QX80 can change greatly. Owners report figures that vary primarily based on driving style and conditions. Those who prioritize smooth acceleration, anticipate traffic flow, and minimize idling are more likely to approach the EPA estimates.

Conversely, aggressive drivers or those who frequently use the QX80 for heavy towing will experience significantly lower MPG. Understanding these potential variations is critical for budgeting and setting realistic expectations for fuel consumption.

How it compares

The 2015 QX80 is in a competitive segment known for prioritizing luxury and capability over outright fuel efficiency. The Cadillac Escalade, another large SUV, managed a nearly identical 17 MPG combined in 2WD form. The Lexus LX 570, known for its ruggedness and reliability, achieves a similar 15 MPG combined. Even the Mercedes-Benz GLS 450 with its turbocharged V6 gets just 20MPG combined. Buyers in this segment often accept lower fuel economy as the price for the space, power, and prestige these vehicles offer. See QX80 MPG across all years to explore fuel efficiency across model years.

Tips to maximize efficiency

The QX80’s large displacement engine responds well to smooth and steady throttle inputs. Avoid abrupt acceleration and hard braking. Anticipate traffic flow and maintain a consistent speed whenever possible to minimize fuel consumption. Also, be sure to review all Infiniti fuel economy data.

Tire pressure plays a significant role in fuel efficiency. Ensure that your tires are properly inflated to the manufacturer’s recommended pressure, which can be found on the driver’s side door jamb or in the owner’s manual. Underinflated tires create more rolling resistance, leading to increased fuel consumption.

Reduce unnecessary weight inside the vehicle. Carrying excessive cargo adds strain on the engine and reduces fuel economy. Remove any items that aren’t essential for your daily commute or planned trips.

Minimize idling time. If you’re waiting for more than a minute or two, it’s more fuel-efficient to turn off the engine rather than let it idle. Modern engines are designed to restart quickly and reliably, making this a simple way to save fuel, especially in city driving. Consider using cruise control when appropriate.