23 MPG combined. That’s not going to win any hypermiling contests. But for the 2021 Mercedes-Benz GLC300 4matic, equipped with its punchy 2.0L turbocharged four-cylinder engine and standard all-wheel drive, it’s a figure that most owners find perfectly acceptable. This is a compact luxury SUV prized for its refined driving experience, opulent interior, and prestigious badge. Buyers are often more concerned with comfort and cachet than squeezing every last mile from a gallon. Fuel efficiency, while considered, rarely tops the list of priorities.

City and highway performance

The EPA estimates the GLC300 4matic will achieve 21 MPG in the city and 28 MPG on the highway. The city figure reflects the stop-and-go nature of urban driving, where the frequent acceleration and braking demands more from the engine. The highway number is more optimistic and achievable during steady-state cruising, where the nine-speed automatic transmission can settle into its higher gears, allowing the engine to operate at lower RPMs. However, aggressive driving or consistent headwinds can easily diminish that highway MPG.

Annual fuel cost

According to the EPA, the estimated annual fuel cost for the 2021 Mercedes-Benz GLC300 4matic is $2,500. This calculation is based on driving 15,000 miles per year and using national average fuel prices. Of course, your actual fuel costs will vary depending on your driving habits, the type of fuel you use, and regional fuel prices. Those who drive primarily in the city or have a heavier foot can expect to exceed this annual estimate. Conversely, drivers who rack up mostly highway miles and practice fuel-efficient driving techniques may spend less.

Real-world expectations

While the EPA provides a standardized benchmark, a lot of GLC300 4matic owners see fuel economy figures that hover slightly below the official ratings. Factors such as driving style, traffic conditions, and even the use of accessories like air conditioning can influence real-world MPG. Expect to see figures closer to 19-20 MPG in the city and 26-27 MPG on the highway in everyday driving. Those who enjoy the spirited acceleration that the turbocharged engine provides will likely see even lower numbers.

How it compares

The GLC300 4matic’s fuel economy sits mid-pack within the competitive set of compact luxury SUVs. An Acura RDX SH-AWD, with its 2.0L turbo engine, achieves a similar 23 MPG combined. A BMW X3 xDrive30i, also using a 2.0L turbo, delivers the same 23 MPG combined rating. However, the Lexus NX 300h hybrid boasts a much higher 31 MPG combined, appealing to those prioritizing less gas. A Volvo XC60 B5 AWD manages 25 MPG combined. For the GLC300 4matic buyer, however, the slight discrepancy of 2 MPG might be worth the sacrifice for the superior interior appointments and driving dynamics they may find appealing over the alternatives. If you’re considering other models, be sure to review all Mercedes Benz fuel economy data before making a decision. You can also review GLC300 MPG across all years.

Tips to maximize efficiency

Take advantage of the GLC300’s driving modes. The “Eco” mode optimizes engine and transmission settings for maximum fuel efficiency. It might slightly dull throttle response, but it can make a noticeable difference, particularly on long highway drives. Experiment with different modes to find the balance between performance and economy that suits your needs.

Gentle acceleration and braking are key. The GLC300’s turbocharged engine responds well to a light foot. Avoid abrupt starts and stops, as these actions consume significantly more fuel. Anticipate traffic flow and try to maintain a smooth, steady pace as often as possible. Leaving more space between you and other vehicles will help with this.

Tire pressure plays an important role in fuel economy. Check your tires regularly and ensure they are inflated to the recommended pressure listed on the driver’s side doorjamb. Underinflated tires increase rolling resistance, which can negatively impact MPG. Proper tire inflation also improves handling and extends tire life.

Reduce unnecessary weight in the vehicle. The more weight the GLC300 has to carry, the more fuel it will consume. Remove any unnecessary items from the trunk or cargo area. While a few extra pounds might not seem like much, they add up over time and contribute to lower fuel efficiency.