23 MPG combined is a figure that demands a nuanced understanding when discussing the 2026 Cadillac CT4 V 2.7L 4-cyl. This isn’t a conventional economy car aiming for spreadsheet supremacy. Instead, this number represents a respectable efficiency achievement for an American sport sedan that prioritizes driver engagement and performance. It’s the balance struck by a 325-horsepower, rear-wheel-drive (or optional all-wheel-drive) machine designed to punch above its weight in the compact luxury performance segment. Buyers of the CT4 V are enthusiasts first, daily commuters second. They appreciate the responsiveness of the turbocharged four-cylinder, the sharp dynamics, and the distinctive Cadillac V-Series aesthetic. For them, getting comfortably into the low-20s for combined mileage with this level of performance is acceptable, and part of the package, a minor trade-off for a daily dose of exhilaration. This is a car for those who demand precise handling and accessible power, and 23 MPG signifies that Cadillac hasn’t completely neglected the pragmatic side of ownership.

City and highway performance

Breaking down the combined figure, the CT4 V 2.7L delivers 20 MPG in city driving and 29 MPG on the highway. The city number, while not groundbreaking, is entirely expected given the vehicle’s mission. The strong 2.7L engine, despite being a four-cylinder, generates substantial torque from low RPMs, which means it’s working to move the CT4 V’s athletic chassis through stop-and-go traffic efficiently. The ten-speed automatic transmission (S10) plays a significant role here, with its wide gear ratio spread allowing the engine to remain in its most efficient operating range, even at slower speeds. On the open road, the 29 MPG highway figure is genuinely commendable for a performance-oriented sedan. This is where the long-legged gearing of the S10 transmission truly shines, keeping engine RPMs low at cruising speeds. The aerodynamic profile and advanced engine management contribute to this strong showing, allowing for extended highway trips without constant fuel stops. It’s a comfortable and surprisingly efficient grand tourer for those spirited weekend drives. You can explore all CT4 MPG across all years to see how this iteration compares.

Annual fuel cost

The EPA estimates an annual fuel cost of $2,500 for the 2026 Cadillac CT4 V 2.7L 4-cyl. This figure is calculated based on an assumption of 15,000 miles driven per year, split between city and highway driving, using national average fuel prices and the vehicle’s specific EPA MPG ratings. For the CT4 V buyer, this $2,500 is simply a line item in their overall luxury vehicle budget. They are investing in a premium driving experience, and while they appreciate efficiency, the annual fuel outlay is secondary to the car’s performance and prestige. This isn’t a purchase driven by the lowest possible operating costs; it’s driven by a desire for a particular type of automotive enjoyment. The cost reflects the commitment to spirited driving and the necessary premium fuel required to maximize the 2.7L engine’s potential.

Real-world expectations

In the real world, owners of the 2026 Cadillac CT4 V 2.7L can realistically expect to achieve numbers closely aligned with the EPA estimates, provided their driving habits are reasonably consistent. Aggressive driving, frequent hard acceleration, and extended periods in Sport or Track modes will naturally pull those figures down, particularly in city driving. The responsiveness of the 2.7L turbo engine, with its impressive 380 lb-ft of torque, can be addictive, and indulging in that power will inevitably consume more fuel. Conversely, those who drive with a lighter foot, anticipate traffic, and use cruise control on the highway will often find themselves matching or even slightly exceeding the 29 MPG highway rating. Factors like severe weather, continuous use of air conditioning, and carrying heavy loads will also have a minor impact. The ten-speed automatic is incredibly adept at optimizing shifts for efficiency, but ultimately, the driver’s right foot dictates the real-world outcome with any performance vehicle.

How it compares

The 2026 Cadillac CT4 V 2.7L finds itself in a competitive landscape, and its fuel economy holds up well against key rivals. Consider the BMW M240i xDrive, a common cross-shop for compact luxury performance. That car, with its more powerful B58 inline-six, typically hovers around 23 MPG combined (20 city/28 highway), a remarkably similar figure to the CT4 V, despite its higher power output. Moving to Mercedes-AMG, a CLA 35 4MATIC, while front-wheel-drive based and slightly smaller, often sees around 25 MPG combined (22 city/29 highway). Even Lexus, with the IS 350 F Sport, powered by a naturally aspirated V6, averages about 22 MPG combined (19 city/26 highway), falling slightly behind the CT4 V. The Cadillac’s 2.7L four-cylinder shows remarkable efficiency when stacked against these established players. It punches effectively, demonstrating that Cadillac can deliver both engaging performance and competitive fuel economy within its segment. For more context on Cadillac’s lineup, explore all Cadillac fuel economy data.

Tips to maximize efficiency

Maintaining consistent throttle input is crucial. The CT4 V’s 2.7L engine delivers strong torque, meaning unnecessary bursts of acceleration and deceleration burn more fuel than smooth, gradual changes in speed.

Anticipate traffic conditions well in advance. Coasting to a stoplight or through a slowdown rather than hard braking and then rapid acceleration can significantly improve city mileage by allowing the transmission to optimize its gear selection more effectively.

Keep the tires properly inflated to the manufacturer’s recommended pressures. Underinflated tires increase rolling resistance, forcing the engine to work harder and directly impacting fuel economy, especially on longer highway journeys.

Use the available drive modes judiciously. While Sport and Track modes sharpen throttle response and hold gears longer, sticking to Tour or My Mode (configured for efficiency) for daily commuting will help the transmission prioritize fuel economy.

Minimize unnecessary weight in the trunk and avoid roof racks when not in use. Every extra pound the engine has to move, or every additional bit of aerodynamic drag, translates directly into increased fuel consumption over time.