The 2019 Mercedes-Benz GLC300, equipped with its 2.0L 4-cylinder engine, achieves a combined fuel economy rating of 24 MPG. That places it in the middle ground for compact luxury SUVs, respectable enough to avoid gas-guzzler status, but not exactly a leader in efficiency. For buyers drawn to the GLC300’s refined interior, advanced technology, and the Mercedes-Benz brand, that 24 MPG might be an acceptable compromise.

City and highway performance

The EPA breaks down the GLC300’s fuel economy further, estimating 22 MPG in the city and 27 MPG on the highway. The city figure reflects the stop-and-go driving conditions that can drag down fuel economy, even in a turbocharged four-cylinder. The highway number shows the efficiency of the 9-speed automatic transmission, allowing the engine to cruise at lower RPMs and conserve fuel on longer trips. For drivers who split their time fairly evenly between urban commutes and highway trips, these figures are generally predictable and align with expectations. This is a vehicle more at home on the open road than battling congested city streets.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2019 Mercedes-Benz GLC300 at $2,400. This figure is calculated based on driving 15,000 miles per year, using the national average fuel prices at the time of calculation. Gas prices can change this number significantly. Expect to pay more if you drive more than 15,000 miles annually or live in an area with higher fuel costs. You will have lower annual fuel expenses if you drive fewer miles. Consider this $2,400 figure a benchmark to personalize based on your individual driving habits and location.

Real-world expectations

While EPA estimates provide a standardized benchmark, real-world fuel economy often varies. Several factors influence the MPG you’ll actually achieve in your 2019 GLC300: your driving style (aggressive acceleration and braking will reduce efficiency), the type of roads you typically drive on (hilly terrain or persistent stop-and-go traffic can lower MPG), and even tire pressure and vehicle maintenance. Owners who prioritize smooth, steady driving and adhere to recommended maintenance schedules are more likely to see numbers closer to the EPA estimates. Some owners report MPG figures aligning with, or slightly exceeding, the EPA’s highway rating on long trips.

How it compares

Several competitors exist in the compact luxury SUV segment, each offering varying degrees of fuel efficiency. The BMW X3 xDrive30i, for instance, earns an EPA-rated 24 MPG combined, matching the GLC300. The Lexus NX 300, with its slightly less powerful engine, manages a slightly better 25 MPG combined. The Acura RDX achieves 23 MPG combined. For those prioritizing fuel economy above all else, the hybrid versions of competitors like the Lexus NX (NX 300h: 31 MPG combined) offer a significant advantage. However, the decision isn’t always about efficiency numbers. Many GLC300 buyers are willing to accept slightly lower MPG for the Mercedes-Benz’s premium interior and engaging driving experience.

Tips to maximize efficiency

Use the GLC300’s drive mode selector wisely. Selecting “Eco” mode will optimize the engine and transmission settings for fuel efficiency, often resulting in noticeably improved MPG, especially in city driving. Use cruise control on the highway. Maintaining a consistent speed reduces driver fatigue and helps to minimize fuel consumption variations.

Regularly check your tire pressure. Underinflated tires create more rolling resistance, forcing the engine to work harder and reducing fuel economy. Consult the sticker on the driver’s side door jamb for the recommended tire pressure for your GLC300.

Minimize unnecessary weight in the vehicle. Carrying extra cargo adds to the vehicle’s overall weight and reduces fuel efficiency over time. Remove any items that aren’t essential from the trunk or cargo area.

Aggressive driving habits are a fuel economy killer. Rapid acceleration, hard braking, and excessive speeding all contribute to increased fuel consumption. Adopt a smoother, more relaxed driving style to maximize your GLC300’s MPG. Consider tracking your fuel economy over time using the vehicle’s trip computer or a fuel tracking app. This will help you identify any driving habits or conditions that may be negatively impacting your MPG. Explore all Mercedes Benz fuel economy data and GLC300 MPG across all years for more insights.