21 MPG combined isn’t going to win any green awards, but for the 2023 Cadillac CT5-V AWD with its potent 3.0L twin-turbo V6, it’s an accepted compromise. This isn’t a car bought by hypermilers or people primarily concerned with lower fuel costs. This is a vehicle for drivers who value a balanced blend of performance, luxury, and all-weather security, and who are willing to pay a little extra at the pump to get it.

City and highway performance

The CT5-V’s EPA ratings break down to 18 MPG in the city and 26 MPG on the highway. The city figure reflects the engine’s thirst when dealing with stop-and-go traffic and frequent acceleration. The twin-turbo V6 needs to build boost to deliver its power, a process that consumes fuel. However, the highway number reveals a more efficient side of the CT5-V. The 10-speed automatic transmission allows the engine to cruise comfortably at lower RPMs, maximizing fuel economy during long stretches. A long-distance cruise will yield the best fuel economy for this vehicle.

Annual fuel cost

The EPA estimates that the annual fuel cost for the 2023 Cadillac CT5-V AWD is $2,750. 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. The calculation also uses the prevailing national average fuel price for premium unleaded gasoline, which is recommended for optimal performance in the CT5-V. Individual fuel costs will vary depending on driving habits, local fuel prices, and the type of gasoline used. For those covering significantly more than 15,000 miles annually, the fuel bill will obviously increase proportionately.

Real-world expectations

The 21 MPG combined rating serves as a useful benchmark, but real-world fuel economy can fluctuate based on driving style and environmental factors. Expect to see figures closer to the city rating if most of your driving is in congested urban environments. Conversely, a preponderance of highway miles, driven with a light foot, could push the average closer to or even slightly above the 26 MPG highway estimate. Aggressive driving, frequent use of the “V-Mode,” and cold weather conditions will all negatively impact fuel consumption.

How it compares

Direct competitors like the BMW M340i xDrive (25 MPG combined) and the Mercedes-AMG C43 4MATIC (22 MPG combined) offer marginally better fuel economy. The Audi S4 achieves a similar 24 MPG combined. The CT5-V’s fuel economy is arguably its weakest aspect in this comparison set. This is one data point where badge loyalty and subjective factors like styling and handling dynamics often eclipse the MPG differential for buyers in this segment. Someone cross-shopping performance sedans at this level isn’t just concerned with fuel economy. They care about the overall driving experience. For those looking for a more frugal option within the Cadillac range, they can explore CT5 MPG across all years and trims. You can also view all Cadillac fuel economy data for more vehicles.

Tips to maximize efficiency

Avoid aggressive acceleration. The CT5-V’s twin-turbo V6 is tempting to unleash, but each burst of power comes at a cost. Gentle acceleration and maintaining a steady speed will significantly improve fuel economy.

Monitor tire pressure regularly. Underinflated tires increase rolling resistance, forcing the engine to work harder and burn more fuel. Check the tire pressure at least once a month and inflate to the recommended levels listed on the door jamb sticker.

Use cruise control on the highway. Maintaining a consistent speed reduces unnecessary acceleration and deceleration, optimizing fuel efficiency for longer journeys. This is especially effective on relatively flat terrains.

Minimize idling. Letting the engine idle for extended periods consumes fuel without covering any distance. If you anticipate being stopped for more than a minute, turn off the engine. The CT5-V’s powertrain restarts quickly.

Reduce weight. Carrying unnecessary cargo in the trunk or rear seats adds weight to the vehicle, decreasing fuel economy. Remove any items you don’t need for your daily commute or road trips.