16 MPG combined is not a bragging point for the 2023 Lexus GX 460. This is the harsh reality of owning a body-on-frame SUV powered by a naturally aspirated V8. However, the GX buyer isn’t prioritizing fuel efficiency; they’re drawn to its legendary reliability, impressive off-road capability, and the cachet of the Lexus brand. They accept the penalty at the pump as the price of admission for a vehicle purpose-built for durability and go-anywhere confidence.

City and highway performance

The GX 460’s EPA estimates reveal a modest discrepancy between city and highway MPG. The city rating sits at 15 MPG, reflecting the engine’s heavy reliance on lower gears and frequent stop-and-go driving. On the open road, the GX climbs slightly to 19 MPG, thanks to the more relaxed cruising speeds and the automatic transmission’s top gear. Drivers should remember that these figures are based on standardized testing, and individual results will vary depending on driving style and conditions.

Annual fuel cost

According to the EPA, the annual fuel cost for the 2023 Lexus GX 460 is $3,600. This calculation assumes 15,000 miles of driving per year, with fuel prices based on the national average. It’s a significant figure, and potential buyers should factor this into their budget alongside insurance, maintenance, and other ownership costs. Those who drive more than 15,000 miles annually, or live in areas with higher fuel prices, can expect to pay even more.

Real-world expectations

While the EPA provides a standardized benchmark, real-world fuel economy can often deviate from the official figures. GX owners frequently report numbers close to the EPA estimates, but aggressive driving habits, heavy loads, and challenging terrains can easily push MPG down. Conversely, careful drivers who prioritize smooth acceleration and maintain consistent speeds might see slightly better results. Wind resistance, tire pressure, and even the type of gasoline used can also play a role.

How it compares

The GX doesn’t fare well against its competitors regarding fuel economy. The Land Rover Defender 110 with its P300 inline-six achieves 19 MPG combined, a noticeable improvement. Even the V8-powered Toyota Sequoia manages 20 MPG combined thanks to its hybrid powertrain. The Jeep Grand Cherokee L, with its available V6 engine, easily surpasses the GX with a combined EPA rating of 22 MPG. These differences underscore the GX’s focus on ruggedness over efficiency, which is a conscious trade-off for its target demographic. Buyers considering the GX should examine GX MPG across all years, and compare those numbers against other vehicles they’re considering.

Tips to maximize efficiency

Given its V8 engine and traditional drivetrain, squeezing extra miles out of the GX requires a mindful approach. Ensure your tires are properly inflated to the recommended pressure; this reduces rolling resistance and improves fuel economy.

Limit unnecessary weight. Removing excess cargo from the vehicle reduces the load on the engine, leading to better fuel efficiency. Each extra pound requires more energy to accelerate and maintain speed.

Anticipate traffic flow and avoid aggressive acceleration and braking. Smooth, gradual inputs conserve fuel by minimizing energy waste. Maintaining a steady speed also helps to optimize fuel consumption on the highway.

Service the vehicle promptly. Regular maintenance, including oil changes and air filter replacements, ensures the engine operates at its peak efficiency. A well-maintained engine consumes less fuel and produces fewer emissions.

Consider using premium fuel as recommended by Lexus. While the GX can technically run on regular gasoline, premium fuel can optimize performance and potentially yield slightly better fuel economy. All all Lexus fuel economy data points to the same maintenance conclusion.