23 MPG combined won’t win any hypermiling awards, but for the 2021 Cadillac XT6 FWD with the 2.0L 4-cylinder, it’s a reasonable compromise. This isn’t a sports car, and it isn’t trying to be. It’s a luxury three-row crossover, bought primarily by families who prioritize space, comfort, and the Cadillac badge. Fuel economy matters, but it’s less important than a smooth ride and a well-appointed interior. The XT6 driver is trading ultimate fuel efficiency for prestige and practicality.

City and highway performance

The EPA estimates for the 2021 Cadillac XT6 FWD 2.0L are 21 MPG in the city and 27 MPG on the highway. The city figure realistically reflects stop-and-go traffic, where the turbocharged engine and nine-speed automatic transmission manage to keep consumption in check. However, the engine works harder to get the XT6 moving from a complete stop. The 27 MPG highway figure is where the XT6 fares better, allowing effortless cruising on long road trips. This is thanks to the transmission’s ability to settle into higher gears, keeping the engine humming along at lower RPMs, resulting in better fuel efficiency. Expect very close to the advertised 27 MPG if you keep the car at steady highway speeds below 75mph.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2021 Cadillac XT6 FWD 2.0L at exactly $2,500. This figure is based on driving 15,000 miles per year, with a roughly even split between city and highway driving, and using the national average fuel prices at the time of calculation. Your own fuel expenses will vary depending on your driving habits, the type of fuel you purchase, and local fuel prices. However, $2,500 gives you a solid baseline for budgeting. Use this figure to plan for the cost of operating an XT6. Drivers covering significantly more than 15,000 miles annually should anticipate higher fuel expenses. You can view all Cadillac fuel economy data to make further purchasing decisions.

Real-world expectations

While the EPA estimates provide a standardized benchmark, expect some variance in the real world. Aggressive driving, heavy loads, and consistently driving in heavy traffic or hilly terrain will lower your MPG. Likewise, regular highway driving and disciplined acceleration will deliver closer to the stated MPG. Don’t be surprised if you see figures slightly below the EPA’s 23 MPG combined rating if you spend most of your time in the city. Drivers prioritizing smooth acceleration and steady speeds, and avoiding excessive idling, report numbers closer to the EPA estimate.

How it compares

The 2021 Cadillac XT6’s fuel economy places it in a competitive, although not exceptional, position within the three-row luxury SUV segment. Direct competitors such as the Acura MDX (around 22 MPG combined for the FWD model with its V6 engine) offer similar figures, but with the Acura, you get a bigger engine. The Lexus RX 350L, another popular choice, achieves around 22 MPG combined as well, showing how consistent this class of vehicle is. Even some smaller, supposedly more efficient crossovers offer comparable fuel economy when equipped with all-wheel drive and turbocharged engines. For instance, a fully loaded Volvo XC60 B5 AWD is likely to get around 24 MPG combined.

Tips to maximize efficiency

Use the XT6’s driving modes. Select “Tour” or “Eco” mode when applicable. These modes are designed to prioritize fuel efficiency by adjusting throttle response, shift points, and even climate control settings. Sport settings are fun, but will significantly lower the fuel economy. Keep this strategy in mind to stay as close as possible to the XT6 MPG across all years.

Pay close attention to tire pressure. Underinflated tires increase rolling resistance, causing the engine to work harder and burn more fuel. Regularly check your tire pressure and inflate your tires to the recommended levels, which are typically found on a sticker located on the driver’s side doorjamb. This ensures optimal fuel efficiency and extends the life of your tires. Many Cadillacs offer a digital tire pressure readout from the infotainment screen, making it simple to monitor.

Minimize idling. If you anticipate being stationary for more than a minute, it’s more fuel-efficient to turn off the engine, especially in city driving. Modern engines are designed to restart quickly and efficiently, and prolonged idling consumes fuel without getting you anywhere. Drivers who work from their car are particularly prone to excess idling and should be aware of maximizing their fuel efficiency.

Consider limiting your top speed on the highway in order to maximize fuel economy. Any speed increases above 65-70mph result in drastically decreased fuel economy. The XT6 is a luxury vehicle focused on comfort, and reducing speeds slightly won’t perceptibly affect the driving experience. Take advantage of the comfortable seats and pleasant ride, and travel in the slow lane.

Properly maintain your vehicle. Regular maintenance, including oil changes, air filter replacements, and spark plug replacements (when needed), ensures that your XT6’s engine is running efficiently. A well-maintained engine burns fuel more completely and produces less emissions. Neglecting maintenance can lead to reduced fuel economy and potentially more costly repairs down the road.