The 2019 Cadillac CT6, with its 2.0L turbocharged four-cylinder engine, gets a combined fuel economy of 28 MPG. While not the best in its class, this number is a compromise for buyers who want a full-size luxury sedan, advanced technology, and distinctive Cadillac styling and are willing to sacrifice some V6 power for less gas.

City and highway performance

Driving the 2019 CT6 with the 2.0L engine gets you an EPA-estimated 24 MPG in the city. Stop-and-go traffic will lower this number, but the engine’s low-end torque helps the car feel responsive. You won’t need to press the accelerator hard to keep up with traffic. The CT6 shines on the open road, achieving an impressive 34 MPG on the highway. This is thanks to the smooth-shifting 10-speed automatic transmission, which keeps the engine at its best RPM. For drivers who often have long commutes or road trips, the CT6’s highway fuel economy is a real benefit.

Annual fuel cost

The EPA estimates that the annual fuel cost for the 2019 Cadillac CT6 2.0L is $2,050. This number is based on driving 15,000 miles per year, with a mix of city and highway driving, and assumes current national average fuel prices. Your actual fuel expenses will change based on your driving habits, local fuel costs, and how much city versus highway driving you do. All Cadillac fuel economy data, including the CT6, can be found on our website.

Real-world expectations

While the EPA is a good guide, it’s key to think about real-world driving. Hard acceleration, frequent hard braking, and constantly high speeds will all reduce fuel economy. Colder weather can also hurt fuel efficiency, as can extra weight in the car. A careful driver with a steady foot can likely get numbers close to, or even a bit better than, the EPA estimates. Check the CT6 MPG across all years to see what past owners are reporting.

How it compares

The 2019 CT6 2.0L is in a segment with other fuel-efficient choices, each with its own appeal. For example, the Lexus GS 300, with its 2.0L turbo engine, gets a combined 24 MPG. The BMW 530i, a benchmark in the segment, gets 27 MPG combined from its 2.0L turbo. The Audi A6 2.0T has similar fuel economy to the BMW. These competitors show that while the CT6’s engine size is similar to others, its fuel economy is good but not the best. The CT6 buyer might accept this because they value the Cadillac’s styling, interior space, and features, such as Super Cruise semi-autonomous driving system. The Acura TLX 2.0T, at 25 MPG combined, shows that cheaper brands may not always get better mileage.

Tips to maximize efficiency

Smooth acceleration is key to getting the best fuel economy in the CT6 2.0L. Avoid hard starts and instead, smoothly increase speed. The car’s low-end torque means you don’t need to push the engine hard to get moving.

Keeping a consistent speed on the highway will also really improve fuel efficiency. Use cruise control to stay at a steady pace and reduce unnecessary acceleration and braking. Constantly changing your speed wastes gas.

Make sure your tires have the right amount of air. Underinflated tires create more rolling resistance, which makes the engine work harder and use more fuel. Check your tire pressure often and inflate them to the level shown on a sticker inside the driver’s side door.

Reduce idling time. If you’re going to be stopped for more than a minute, turn off the engine. Modern engines are made to be restarted without causing wear, and you’ll save fuel by avoiding unnecessary idling.

Think about using the CT6’s drive modes. Switching to “Tour” or “Eco” mode can change the car’s throttle response and transmission to prioritize fuel efficiency over performance. Use these modes when you want the best fuel economy.