15 MPG combined is the reality for those considering the 2025 Cadillac CT5 V with its strong 6.2L V8. This isn’t a car bought for its fuel sipping abilities. It’s a performance sedan, designed for people who prioritize raw power and exhilarating driving over concerns about trips to the gas station. The CT5 V buyer is chasing a visceral experience and a connection to the golden age of American muscle. The sound of a supercharged V8 is music to their ears, and the relatively low gas mileage is the price of admission to that world.

City and highway performance

The official EPA estimates provide a clearer picture of where the CT5 V drinks the most. The stop-and-go conditions of city driving yield a meager 13 MPG. The supercharged engine, the car’s weight, and the frequent demands on the throttle result in frequent gas station visits when navigating urban settings. Out on the open road, the CT5 V fares somewhat better, achieving 20 MPG on the highway. While not stellar, this figure allows reasonable road trips, especially if the driver shows some constraint with the accelerator pedal. However, even slight increases in speed can dramatically impact fuel efficiency.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2025 Cadillac CT5 V at $3,850. This figure is based on driving 15,000 miles per year, with 55% of those miles driven in the city and 45% on the highway, using national average fuel prices. For the CT5 V owner, this is a significant expense and a reminder that the thrill of driving such a powerful machine comes with a tangible financial burden. This isn’t a car for penny-pinchers, it’s for those who are willing and able to allocate a substantial portion of their transportation budget to fuel costs.

Real-world expectations

While the EPA estimates provide a baseline, real-world fuel economy can vary considerably based on driving style and conditions. The CT5 V’s supercharged V8 is particularly sensitive to aggressive driving, so lead-footed drivers can expect to see even lower gas mileage than the official estimates. Conversely, those who prioritize smooth acceleration and maintain consistent speeds may be able to approach the EPA figures, especially on longer highway drives. Ultimately, the actual fuel economy heavily depends on the individual driver’s habits and the prevailing traffic conditions.

How it compares

Compared to other performance sedans, the CT5 V’s fuel economy is predictably low. The BMW M5 Competition, despite its similar performance figures and all-wheel drive, manages a slightly better 17 MPG combined. The Mercedes-AMG C63 S, with its potent V8, achieves similar figures at 18 MPG combined. Even the less powerful Audi S6, with its turbocharged V6, obtains a more respectable 22 MPG combined rating. These comparisons highlight the CT5 V’s focus on raw power, prioritizing performance over fuel efficiency to a degree not seen in some of its competitors. If fuel efficiency is a priority, there are undoubtedly better options, but none offer the same visceral character and old-school charm of the Cadillac. You can also view CT5 MPG across all years.

Tips to maximize efficiency

While the CT5 V isn’t designed for fuel economy, there are steps you can take to improve your gas mileage. Try to anticipate traffic flow and avoid sudden acceleration and braking. Smooth driving is key to minimizing fuel consumption, especially with a supercharged engine that readily consumes fuel under heavy throttle.

Use the car’s drive mode selector to your advantage. The “Tour” mode optimizes the engine and transmission settings for fuel efficiency, sacrificing some performance in the process. While it won’t transform the CT5 V into a hybrid, it can help to reduce fuel consumption during everyday driving.

Ensure that your tires are properly inflated. Underinflated tires increase rolling resistance, which reduces fuel efficiency. Check your tire pressure regularly and inflate them to the recommended levels, which can be found on the driver’s side doorjamb.

Avoid carrying unnecessary weight in the car. Every additional pound reduces fuel efficiency, so remove any items that you don’t need. A clean, empty trunk translates to slightly better gas mileage.

Finally, keep up with routine maintenance. A well-maintained engine runs more efficiently, so follow the manufacturer’s recommended service schedule for oil changes, air filter replacements, and other essential services. For all Cadillac fuel economy data, view our Cadillac MPG database.