The 2020 Mercedes-Benz AMG CLA45 gets 23 MPG combined, which isn’t winning any efficiency awards, but frankly, it’s beside the point. This aggressively styled, high-performance coupe (marketed as a “4-door coupe,” of course) trades fuel sipping for grin-inducing acceleration and razor-sharp handling. The CLA45 buyer isn’t prioritizing saving money at the pump; they crave a potent, tech-laden machine that announces its presence, and this one delivers. This car is about engineering, power, speed and it’s ok if it wants to make a little pit stop more often than others.

City and highway performance

The EPA estimates peg the 2020 AMG CLA45 at 20 MPG in the city and 29 MPG on the highway. The city figure reflects the stop-and-go driving that can really hurt fuel economy, especially when you’re tempted to exploit the turbocharger’s quick acceleration. That highway number, while respectable, likely requires a disciplined right foot. The temptation to dip into the CLA45’s power for passing maneuvers will surely see that 29 MPG figure decrease. You are behind the wheel of a machine that can get from zero to 60 mph in 4.0 seconds. Highway efficiency is likely attainable, but requires constant attention to driving.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2020 Mercedes-Benz AMG CLA45 at $2,500. This figure is based on driving 15,000 miles per year and using the national average fuel price for premium gasoline, which the CLA45 requires. Fuel prices vary wildly across the country, so the actual cost could be higher or lower depending on your location and driving habits. Considering this car, a responsible driver might be able to fall below the $2,500 annual fuel cost, but it’s very unlikely.

Real-world expectations

While the EPA provides a standardized benchmark, real-world fuel economy is heavily dependent on driving style and conditions. Regular bursts of acceleration, prolonged idling, and aggressive driving will definitely lower the fuel economy. The AMG CLA45’s performance-oriented nature makes it very susceptible to these influences. Drivers who spend most of their time in congested urban environments can expect figures closer to the 20 MPG city estimate. Those who primarily commute on the highway, and resist the urge to exercise the engine’s full potential, may see numbers closer to or even slightly above the 29 MPG highway figure. In general, hitting the 23 MPG combined rating consistently would require a conscious effort towards efficient driving.

How it compares

Compared to its rivals, the AMG CLA45’s fuel economy falls within the expected range for a high-performance compact. The BMW M235i xDrive Gran Coupe, with a similar focus on performance, achieves a slightly better 26 MPG combined. The Audi S3, another potent compact sedan, also posts a 26 MPG combined rating. These differences, while noticeable on paper, may not be significant enough to sway buyers in this segment, who generally prioritize performance and brand cachet over fuel savings. Ultimately, buyers look at AMG MPG across all years but this car is in a unique class.

Tips to maximize efficiency

The AMG CLA45’s powerful engine and responsive transmission are sensitive to driving habits. Gentle acceleration and smooth braking can make a surprising difference, preventing the turbocharger from activating unnecessarily and reducing wasted energy. Anticipating traffic flow and maintaining a steady speed also helps minimize fuel consumption.

Ensure your tires are properly inflated to the recommended pressure. Underinflated tires increase rolling resistance, forcing the engine to work harder and burning more fuel. Check tire pressure regularly, especially during seasonal temperature changes.

Remove any unnecessary weight from the vehicle. Extra cargo in the trunk or passenger area adds strain on the engine and reduces fuel economy. Keeping the car clutter-free can contribute to minor but noticeable gains in efficiency.

Regular maintenance, including oil changes and air filter replacements, is critical. A well-maintained engine runs more efficiently, maximizing fuel economy and ensuring optimal performance. Follow the service schedule recommended by Mercedes-Benz. You’ll find that all Mercedes Benz fuel economy data generally has high service recommendations.