The 2021 Infiniti QX80 4WD 5.6L 8-cyl gets 15 MPG combined, and buyers of this full-size luxury SUV likely know that already. This vehicle isn’t bought for its frugality; it’s chosen for its imposing presence, spacious cabin, powerful V8 engine, and genuine towing capability. The QX80 delivers a specific kind of experience, and for many owners, the fuel consumption is simply the cost of ownership.

City and highway performance

The EPA estimates the QX80 4WD manages 13 MPG in the city and 19 MPG on the highway. The city figure reflects the demands on the 5.6L V8 in stop-and-go traffic, where its weight takes its toll. The highway number is more acceptable, helped by the seven-speed automatic transmission that allows the engine to cruise at lower RPMs. Even on the open road, the QX80’s aerodynamic profile and weight prevent it from achieving truly impressive fuel economy, understanding the difference between city versus highway performance is important for prospective owners who might primarily use the vehicle for urban commutes or long-distance family trips.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2021 Infiniti QX80 4WD is $3,850. This is based on driving 15,000 miles per year, with 55% of those miles driven in the city and 45% on the highway, using national average fuel prices. This large annual cost should be carefully considered as part of the overall ownership expenses, especially relative to other luxury SUVs that offer better fuel efficiency.

Real-world expectations

While the EPA estimates provide a standardized benchmark, real-world fuel economy can change a lot based on driving habits, traffic, and terrain. Quick acceleration, frequent hard braking, and long idling will all hurt fuel consumption. Likewise, driving in hilly areas will likely mean lower MPG figures than those on flat roads. Owners who regularly tow trailers or carry heavy loads should expect worse fuel economy. The 15 MPG combined figure should be seen as a general guideline, and individual results may differ.

How it compares

The QX80’s fuel economy is on the low end of the full-size luxury SUV segment. Competitors like the Cadillac Escalade with its 6.2L V8 gets around 16 MPG combined, while the Lincoln Navigator with its twin-turbocharged V6 manages roughly 17 MPG combined. Even the Lexus LX 570, another V8-powered rival, posts similar numbers of around 15 MPG combined. For buyers prioritizing fuel efficiency, options like the hybrid-powered Lexus TX 550h offer much better economy, reaching over 20 MPG combined. These options might not tow as much or have the V8 engine feel that QX80 buyers want. You can find all Infiniti fuel economy data on our site to compare. Prospective owners should weigh the QX80’s strengths against its fuel consumption compared to other choices before deciding; examine the QX80 MPG across all years for more details.

Tips to maximize efficiency

While the QX80 isn’t very fuel-efficient, owners can take steps to get better MPG. Avoid quick acceleration and hard braking, as these driving habits really lower fuel economy. Accelerate gently so the engine works better.

Make sure the tires have the right amount of air, usually found on a sticker inside the driver’s side door. Low tires increase rolling resistance, which uses more fuel. Check tire pressure often.

Remove extra weight from the vehicle. Heavy items in the cargo area can hurt fuel economy. Remove anything not needed for daily driving, especially when not towing.

Only use four-wheel drive when needed, such as off-road or in slippery conditions. Driving in four-wheel drive on dry roads uses more fuel because of how the drivetrain works. Use 2WD when you can.

Plan routes to avoid stop-and-go traffic, if possible, as traffic lowers fuel economy. Use navigation apps to find less crowded routes to help improve fuel mileage.