24 MPG combined is an acceptable figure for the 2022 Mercedes-Benz GLC300, but it’s not a selling point. This is a compact luxury SUV, and while fuel efficiency is always a consideration, GLC300 buyers prioritize comfort, brand prestige, and driving experience over squeezing every last mile from a gallon of premium fuel. They’re seeking a refined, well-equipped vehicle that makes a statement, and they’re willing to pay a premium at the dealership and the pump. While it’s no Prius, the GLC300’s economy is adequate for its class.

City and highway performance

The EPA estimates the 2022 GLC300 will achieve 22 MPG in the city and 27 MPG on the highway. These figures reflect the realities of urban driving; stop-and-go traffic, frequent acceleration, and lower average speeds strain fuel economy. The highway number demonstrates the efficiency potential of the GLC300’s 2.0L turbocharged engine and smooth-shifting 9-speed automatic transmission when cruising at a constant speed. The engine needs to work harder than you might think to move a vehicle weighing over 4,000 pounds, so don’t expect to hit that 27 MPG if you’re constantly passing or driving aggressively.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2022 Mercedes-Benz GLC300 at $2,400. This calculation is based on driving 15,000 miles per year and using the EPA’s estimated combined fuel economy of 24 MPG. It also assumes the use of premium gasoline, which is typically more expensive than regular unleaded. This figure provides a standardized way to compare the fuel costs of different vehicles, but individual spending will vary based on driving habits, fuel prices in your area, and the actual number of miles driven each year. However, $2,400 is a worthwhile benchmark when budgeting for your GLC300.

Real-world expectations

The EPA estimates provide a useful baseline, but your actual MPG will vary. Aggressive driving, hard acceleration, frequent short trips when the engine is cold, and even weather conditions can all negatively impact fuel economy. The GLC300’s turbocharged engine delivers ample power, but exploiting that power comes at a fuel cost. If you frequently engage the sport mode, anticipate lower mileage. Similarly, consistent towing (even light loads) or carrying extra weight in the vehicle will reduce efficiency. Drivers with a gentle foot and mostly highway miles will likely see figures closer to, or even slightly above, the EPA’s estimates. Use the vehicle’s trip computer to monitor your fuel consumption and adjust your driving accordingly.

How it compares

The GLC300’s fuel economy positions it competitively within its segment. The BMW X3 sDrive30i, with its similar 2.0L turbocharged engine, achieves an EPA combined rating of 25 MPG. The Lexus NX 350h hybrid offers significantly better fuel economy at 39 MPG combined while sacrificing some performance feel. Audi’s Q5 delivers 26 MPG combined with its 2.0-liter turbo engine. For the GLC300 buyer, the Lexus’ vastly superior mileage may be tempting, but they might be swayed by the Mercedes’ styling, interior appointments, or the cachet of the three-pointed star. Knowing GLC300 MPG across all years can help you decide if a newer or older model suits your needs.

Tips to maximize efficiency

The GLC300’s 9-speed automatic transmission is designed to optimize fuel economy by keeping the engine in its most efficient operating range. Use this by accelerating smoothly and avoiding abrupt changes in speed. Let the transmission do its job, and avoid manually downshifting unless necessary for safety.

Keep your tires properly inflated. Low tire pressure increases rolling resistance, which forces the engine to burn more fuel. Check your tire pressure regularly, especially with seasonal temperature changes, and inflate them to the recommended pressure listed on the doorjamb sticker. Even a few PSI below the recommended level can noticeably affect fuel economy.

Minimize idling. Modern engines, including the GLC300’s, consume fuel even when stationary with the engine running. If you’re waiting for more than a minute or two, turn off the engine. This is particularly relevant in stop-and-go traffic or when waiting to pick someone up.

Reduce aerodynamic drag by removing roof racks or cargo carriers when they are not in use. These accessories increase wind resistance, requiring the engine to work harder to maintain speed. Even a seemingly small surfboard on the roof can significantly impact MPG.

Service your GLC300 according to the manufacturer’s recommendations. Regular maintenance, including oil changes, air filter replacements, and spark plug changes, ensures that the engine is running efficiently. A well-maintained engine will always deliver better fuel economy than one that is neglected. Find all Mercedes Benz fuel economy data here.