The 2019 Cadillac CT6 AWD with the 3.6L V6 gets 21 MPG combined. While not the most fuel-efficient, it’s reasonable for a large, American luxury sedan designed for comfortable cruising and confident all-weather performance. CT6 buyers want smooth power, a spacious cabin, and the Cadillac name, accepting this fuel consumption.

City and highway performance

The EPA estimates the 2019 Cadillac CT6 AWD 3.6L gets 18 MPG in the city and 27 MPG on the highway. The city figure reflects stop-and-go traffic, where the CT6’s weight and automatic transmission affect efficiency. The highway number indicates its long-distance touring capabilities. The 10-speed automatic transmission helps here, keeping the engine in its optimal efficiency range at higher speeds. This difference between city and highway ratings shows the CT6 is best for drivers who spend more time on open roads than in city traffic.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2019 Cadillac CT6 AWD 3.6L at $2,100. This is based on driving 15,000 miles per year, with 55% in the city and 45% on the highway, using national average fuel prices. Note that your actual fuel costs can change based on your driving, road conditions, and gasoline prices. Drivers who accelerate hard or idle a lot will likely see higher annual fuel costs. Those who drive conservatively and mainly on the highway could spend less.

Real-world expectations

Real-world fuel economy can vary from the EPA estimate. Many CT6 owners report numbers close to the EPA figures on average, but individual results depend on driving style and conditions. Expect lower fuel economy in colder months, as the engine requires more fuel during start-up and winter tires can increase rolling resistance. Hard acceleration, frequent hard braking, and extra weight in the vehicle will also hurt fuel consumption. All-wheel drive uses more fuel, but many CT6 owners value the security it provides.

How it compares

The 2019 Cadillac CT6’s fuel economy is in the middle of its class. The BMW 540i xDrive, for example, gets a slightly better 25 MPG combined, thanks to its turbocharged engine and efficient design. The CT6 offers more interior space and a different driving experience that some buyers prefer. An Audi A6 with Quattro will achieve around 24 MPG combined. Compared to the Lexus GS 350 AWD, which gets around 22 MPG combined, the CT6 is similar. These slight differences matter less to the typical CT6 buyer who is focused on comfort and prestige, and more on value for the size of vehicle they are getting. You can explore all Cadillac fuel economy data on FuelEconomyHub.com. Also check out CT6 MPG across all years for a broader perspective.

Tips to maximize efficiency

Keep your tires properly inflated. This reduces rolling resistance and improves fuel economy. Check your tire pressure, especially during seasonal changes.

Avoid aggressive driving. Rapid acceleration and hard braking use more fuel. Smooth driving will help your fuel economy.

Reduce idling. Idling wastes fuel, especially in modern engines. If you expect to be stopped for more than a minute, turn off the engine. The CT6’s engine management system can handle frequent restarts.

Use cruise control on the highway. Maintaining a consistent speed helps optimize fuel efficiency. Cruise control prevents unnecessary acceleration; resist speeding, as fuel economy drops dramatically at higher speeds.

Keep up with scheduled maintenance. Regular oil changes, air filter replacements, and tune-ups ensure your engine is running efficiently. A poorly maintained engine will consume more fuel and could lead to more costly repairs.