23 MPG combined from the 2021 Mercedes-Benz AMG CLA45 4matic 2.0L 4-cyl isn’t going to win any efficiency awards, but that’s not the main point. This is a hand-built, manic performance machine disguised as a compact sedan, and its fuel consumption reflects that. Buyers aren’t cross-shopping with Prius drivers; they’re looking for visceral thrills and accept the MPG penalty that comes with them.

City and highway performance

The EPA estimates the AMG CLA45 at 20 MPG in the city and 29 MPG on the highway. The city figure reflects the stop-and-go nature of urban driving, which taxes any engine, especially one tuned for maximum output. The highway number, while better, still shows the car’s character. Even at cruising speeds, the turbocharger is ready to spool up quickly, and the short gearing of the AMG Speedshift DCT 8G transmission means the engine is always in the heart of its powerband. Drive it gently, and you might see numbers approaching the EPA’s estimate. Drive it like it was intended, however, and prepare for dips.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2021 AMG CLA45 at $2,500. This figure is based on driving 15,000 miles per year and assumes national average fuel prices. As a performance vehicle, the AMG CLA45 requires premium fuel, which usually costs more than regular unleaded. This contributes to the higher annual fuel cost compared to a more fuel-efficient vehicle. Individual results will vary greatly depending on driving habits and local fuel prices, but $2,500 is a reasonable baseline for estimating your fuel budget.

Real-world expectations

Consider the EPA numbers as a best-case scenario. In the real world, especially if you plan on using the AMG CLA45’s strong power, expect closer to 20 MPG overall. Spirited driving, which is almost unavoidable in this car, will drastically reduce your fuel economy. Short trips make the problem worse, as the engine never reaches its optimal operating temperature. The AMG CLA45 isn’t designed for errand runs; it’s engineered for thrilling backroad blasts. Owners who prioritize performance over frugality will find the trade-off acceptable, but those seeking a truly economical daily driver should look elsewhere. You can see AMG MPG across all years to understand how this figure compares to the rest of the performance car lineup.

How it compares

Compared to its rivals, the AMG CLA45’s fuel economy is in the middle. The BMW M2 Competition, with its inline-six, delivers around 20 MPG combined in real-world driving. The Audi RS3, another direct competitor, achieves similar figures, hovering around 19-21 MPG combined. Even the less powerful (but still potent) Volkswagen Golf R manages only around 26 MPG combined.

The slightly larger BMW M340i achieves about 26 MPG as well, a number that might tempt some buyers looking for more practicality and slightly less gas, although they will be sacrificing some of the unhinged character of the AMG CLA45. The relevance of these comparisons, however, depends on the buyer’s priorities. Someone drawn to the AMG CLA45’s aggressive styling, hand-built engine, and ferocious acceleration will likely overlook a minor MPG disadvantage.

Tips to maximize efficiency

While fuel efficiency isn’t the AMG CLA45’s strength, you can still take steps to improve your MPG. Avoid aggressive acceleration and braking. The engine’s immense power is tempting, but gentle throttle inputs will conserve fuel and reduce wear on the tires and brakes. Use the car’s drive modes, selecting “Comfort” or “Eco” for everyday driving. These modes remap the throttle response and shift patterns, prioritizing fuel economy over performance.

Keep your tires properly inflated. Underinflated tires increase rolling resistance, which reduces fuel economy. Check your tire pressures regularly and maintain the recommended levels specified on the door jamb. Schedule regular maintenance. A well-maintained engine runs more efficiently. Ensure your car receives timely oil changes, air filter replacements, and spark plug inspections.

Minimize idling. Letting the engine idle wastes fuel. If you anticipate a prolonged stop, turn off the engine. Plan your routes carefully. Avoiding congested areas and choosing routes with fewer stoplights can improve your fuel economy.

Be mindful of your cargo and passenger weight. Extra weight increases the engine’s workload, so minimize unnecessary items. Removing things like golf clubs, sports equipment, and other heavy items when you don’t need them will help improve fuel economy. You can find all Mercedes Benz fuel economy data on our site.