25 MPG combined for the 2021 Cadillac CT4 equipped with the 2.7L turbocharged four-cylinder might seem unremarkable. But consider that this is a rear-wheel-drive (or optional all-wheel-drive) sport sedan with over 300 horsepower and an engaging driving experience. It’s a performance machine that also delivers reasonably efficient transportation, not an economy car pretending to be sporty. Buyers who want sharp handling and quick acceleration know that compromises are required, and fuel economy is often one.

City and highway performance

The EPA estimates the 2021 Cadillac CT4 2.7L at 21 MPG in the city and 31 MPG on the highway. This difference reflects the engine’s design, which emphasizes readily available torque at all engine speeds. In the city, the turbocharger works harder to provide instant response, which impacts fuel consumption. However, on the open road, where the engine cruises at lower RPMs, the 31 MPG highway figure is achievable. The ten-speed automatic transmission also plays an important role, keeping the engine in its most efficient operating range, which further helps highway efficiency.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2021 Cadillac CT4 2.7L is $2,300. This is based on driving 15,000 miles per year and using national average fuel prices. Your actual fuel costs will vary depending on your driving habits, the type of fuel you use (premium is recommended for best performance), and local gasoline prices. Expect that $2,300 figure to increase if you primarily drive in the city or accelerate hard. Conversely, you may spend less if you primarily drive on the highway and drive efficiently.

Real-world expectations

While the EPA provides a standardized estimate, real-world fuel economy varies. Owners of the 2021 CT4 2.7L often report seeing figures close to the EPA estimates, especially on longer trips. However, aggressive driving, frequent short trips, and stop-and-go traffic will lower your MPG. The onboard fuel economy gauge monitors your driving habits and helps identify areas for improvement. The CT4’s performance nature might tempt you to drive hard, which will reduce fuel economy. It’s a balancing act between enjoying the car’s capabilities and controlling fuel costs.

How it compares

The CT4 2.7L is in the compact luxury sport sedan segment with competitors that have varying fuel efficiency. The BMW 330i, for example, achieves a combined 28 MPG with its 2.0L turbocharged four-cylinder. This offers slightly better fuel economy but less power than the CT4’s 2.7L. The Mercedes-Benz C300, another key rival, also has a 28 MPG combined rating with its 2.0L turbo. The Cadillac’s more powerful engine and available all-wheel drive appeal to buyers who prioritize performance over fuel efficiency. The Lexus IS 300 achieves around 24 MPG combined with its base engine, for those seeking less gas, but offers a less engaging driving experience. Examining all Cadillac fuel economy data will illustrate Cadillac lineup differences, and research into CT4 MPG across all years gives a broader view of the model’s history.

Tips to maximize efficiency

The 2.7L turbo in the CT4 responds well to smooth, consistent throttle inputs. Avoid rapid acceleration and braking, as these actions consume more fuel. Anticipate traffic flow and maintain a steady speed. The ten-speed automatic will select the most efficient gear for the driving conditions.

Correct tire inflation is essential for optimal fuel economy. Check your tire pressure and inflate your tires to the manufacturer’s recommended specifications, which are on the driver’s side doorjamb. Underinflated tires create more rolling resistance, which reduces fuel efficiency.

Reduce weight in your vehicle. Extra cargo adds weight, which makes the engine work harder and use more fuel. Remove items you don’t need to carry regularly.

Consider using cruise control on the highway to maintain a consistent speed. This helps prevent unintentional speeding and maintains a more efficient pace, for better fuel economy on long drives. However, use cruise control carefully in hilly terrain. The system might downshift to maintain speed, which reduces fuel savings.