23 MPG combined for the 2025 Mercedes-Benz AMG CLA45 S 4MATIC is not a number that will win any efficiency prizes, nor is it meant to. This compact performance sedan, despite its strong 2.0L turbocharged engine producing over 400 horsepower, still offers everyday usability. This 23 MPG figure is not a compromise, but rather an accepted reality for a driver seeking relentless acceleration, razor-sharp handling, and the undeniable prestige of an AMG badge, all while maintaining some practicality in a punchy, aggressive package.

City and highway performance

For specifics, the 2025 AMG CLA45 S achieves 20 MPG in city driving and 28 MPG on the highway. The city figure reflects the vehicle’s character: a powerful, high-revving engine mated to an 8-speed automatic transmission that is eager to drop gears and surge forward. Stop-and-go traffic, the bane of any performance car’s fuel economy, will see the CLA45 S consume fuel at a quicker rate. Its enthusiast owner, however, knows this and likely embraces the intoxicating snarl and instant thrust that comes with every blip of the throttle. The 28 MPG highway figure is more commendable, suggesting that when cruising at a steady speed, the advanced powertrain, despite its immense output, can settle down and operate with reasonable efficiency. This flexibility is key for buyers who might use their CLA45 S for spirited weekend drives but also for occasional longer journeys where comfort and some economy are appreciated.

Annual fuel cost

The EPA estimates an annual fuel cost of $2,500 for the 2025 Mercedes-Benz AMG CLA45 S 4MATIC. This figure is calculated based on an average of 15,000 miles driven per year, split between city and highway driving, and using national average fuel prices. For the dedicated AMG enthusiast, this annual expenditure is simply part of the cost of admission to a world of exhilarating performance. It’s a transparent reflection of the vehicle’s power output and consumption habits, not a deterrent. Owners of the CLA45 S prioritize the visceral thrill of driving, the precision engineering, and the luxury experience that Mercedes-AMG provides. The $2,500 annual fuel bill is an expected line item in their automotive budget, representing a commitment to uncompromised driving pleasure.

Real-world expectations

In the real world, owners of the AMG CLA45 S will find the EPA figures to be a good baseline, though individual results will vary significantly based on driving style. This is a car designed to be driven with gusto, and those who frequently exploit its prodigious power will see their MPG dip below the official ratings. Aggressive acceleration, frequent use of sport modes, and spirited cornering will all contribute to higher fuel consumption. Conversely, a driver with a lighter foot, who primarily uses the vehicle for highway commuting in comfort mode, might even slightly exceed the 28 MPG highway rating. The character of the CLA45 S encourages an engaging driving experience, and its target audience understands that such a machine demands a certain level of fuel consumption. They buy this car not for frugality, but for the thrill it delivers every time the engine awakens. This balance of everyday usability with track-ready performance is precisely why the CLA45 S finds its niche with buyers who appreciate a finely tuned machine that can do a bit of everything, albeit with a performance bias.

How it compares

When stacked against its primary rivals, the 2025 AMG CLA45 S 4MATIC positions itself squarely within the performance compact segment, where efficiency is a secondary concern to power and handling. A key competitor, the Audi RS 3, with its 2.5L 5-cylinder engine, also offers similar outright performance and often clocks in with a combined MPG around 23-24. The BMW M2 (automatic transmission) similarly yields around 20-21 MPG combined, though it represents a slightly different philosophy as a rear-wheel-drive coupe. Even the much-lauded Porsche 718 Cayman GT4, while a different category, shows that high-performance 2.0L engines, when pushed to these outputs, will deliver fuel economy in the low to mid-20s. For the demographic considering the CLA45 S, these MPG numbers are entirely expected and acceptable. They are not cross-shopping with hybrid sedans; they are looking for the most engaging, fastest compact performance car their money can buy. The comparisons highlight that the CLA45 S, despite its powerful engine, is competitive within its segment from a fuel consumption standpoint, an achievement given its class-leading output. Explore AMG MPG across all years to see how this model compares to its ancestors.

Tips to maximize efficiency

While the AMG CLA45 S isn’t built for hypermiling, its owners can still coax out maximum efficiency without sacrificing too much fun. Engaging the ECO or Comfort driving modes will soften throttle response and optimize gear shifts for economy, making a noticeable difference in daily commuting. These modes allow the turbocharged engine with its advanced management system to operate in its most efficient parameters when full power isn’t required.

Maintaining consistent highway speeds and using adaptive cruise control can further enhance highway MPG. Avoiding rapid acceleration and hard braking, instead opting for smooth, progressive inputs, will reduce unnecessary fuel consumption, particularly in stop-and-go traffic. This not only saves fuel but also makes for a more refined driving experience.

Regular maintenance is crucial for any high-performance vehicle, and the CLA45 S is no exception. Ensuring that the engine oil, air filters, and tire pressures are all within specifications will allow the car to operate at its peak efficiency, directly impacting fuel consumption. A well-maintained engine is an efficient engine.

Selecting the correct octane fuel is imperative for the CLA45 S. This turbocharged engine is designed for premium unleaded, and using lower octane fuel can lead to reduced performance and suboptimal fuel economy, as the engine’s management system will adjust ignition timing to prevent knock. Always adhere to the manufacturer’s recommendations for fuel type.

Ultimately, driving style is the most significant factor. While the CLA45 S beckons for spirited driving, judicious use of the throttle and a sensible approach to everyday situations will undeniably improve fuel economy without compromising the car’s dynamic capabilities when they are truly called upon. Discover more about all Mercedes Benz fuel economy data.