15 MPG combined. The 2020 Infiniti QX80 4WD’s fuel economy is low. To focus solely on that number is to misunderstand who buys this vehicle and why. The QX80 is an expression of capability and luxury, a status symbol that prioritizes space, power, and presence over efficiency. For its target demographic, families who regularly tow boats or campers, shuttle multiple kids and their friends, or simply desire the imposing feeling of commanding a large SUV, fuel cost is a secondary consideration, falling far behind factors like towing capacity and interior volume.

City and highway performance

The EPA estimates show the QX80 achieving 13 MPG in the city and 19 MPG on the highway. The city figure reflects moving nearly three tons of SUV through stop-and-go traffic. The 5.6L V8 needs to work hard, and that effort translates directly into fuel consumption. The highway figure offers a slightly less painful picture, but still lags behind many competitors. Reaching 19 MPG requires a light foot on the accelerator; aggressive passing or sustained high speeds will reduce that number. Consistent highway driving will yield the best fuel economy you can realistically achieve in this SUV.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2020 Infiniti QX80 4WD at $3,850. This figure 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 at the time the EPA tests were conducted. It’s a reminder of the financial commitment required to operate a vehicle of this size and power. Fluctuating gas prices will directly impact this number; a significant price increase could easily push the annual cost well above $4,000. Prospective buyers should carefully consider that.

Real-world expectations

While the EPA estimates provide a baseline, real-world fuel economy often differs. Drivers who frequently tow, live in hilly areas, or have a heavy foot will likely see numbers below the official ratings. Conversely, those who primarily use the QX80 for long highway trips and drive conservatively might see figures slightly above. Terrain plays a role. The QX80’s weight is heavily taxed by inclines, especially when fully loaded with passengers and cargo. The QX80’s all-wheel drive system provides added traction and stability, and contributes to increased fuel consumption compared to a rear-wheel drive model. Before buying, research QX80 MPG across all years to understand how different driving habits can affect efficiency.

How it compares

The QX80’s fuel economy is not great when compared to its rivals. A Cadillac Escalade with the 6.2L V8 manages a slightly better 17 MPG combined, while the Lincoln Navigator, with its turbocharged 3.5L V6, achieves 18 MPG combined. Even the less powerful Lexus LX 570, with its reliable V8, hits 14 MPG combined, close to, but still trailing, the QX80. The difference lies in engine technology and weight management. While the QX80 provides power, it lacks the fuel-saving technologies found in some of its competitors. Buyers considering these alternatives are often weighing fuel economy against other benefits, such as styling, brand prestige, or specific features. Before digging too deep into this vehicle, check all Infiniti fuel economy data for even more info.

Tips to maximize efficiency

Avoid aggressive acceleration. The QX80’s large engine responds readily to throttle input, but every press of the accelerator burns fuel. Gradual acceleration allows the engine to operate more efficiently and minimizes fuel waste. Imagine you have a cup of coffee on the dash and you are trying not to spill it.

Maintain proper tire pressure. Underinflated tires increase rolling resistance, forcing the engine to work harder and reducing fuel economy. Check your tire pressure regularly and inflate to the recommended specifications. The tire pressure will be listed on a sticker in the driver’s side door jamb.

Limit towing and heavy loads. While the QX80 is capable of towing weight, doing so reduces fuel economy. Only tow when necessary and avoid carrying unnecessary cargo. Think of the vehicle like a runner wearing a weight vest, it will take a lot more effort just to move than without the vest.

Use cruise control on the highway. Maintaining a constant speed on the highway minimizes unnecessary acceleration and deceleration, improving fuel economy. Disengage cruise control in hilly terrain to prevent the transmission from constantly downshifting.

Keep up with scheduled maintenance. A properly maintained engine runs more efficiently. Regular oil changes, air filter replacements, and spark plug maintenance can all contribute to improved fuel economy. Following the factory service guidelines is best practice.