25 MPG combined is an acceptable figure for the 2020 Mercedes-Benz GLC350e 4matic, but don’t mistake “acceptable” for outstanding. This plug-in hybrid SUV caters to a specific buyer: someone who wants a touch of green credibility without sacrificing the luxury and prestige associated with the Mercedes-Benz star. These buyers are often willing to trade ultimate fuel efficiency for the cachet and driving experience the GLC350e provides. It’s a compromise they understand, and frankly, expect.

City and highway performance

The EPA estimates suggest a split of 23 MPG in the city and 28 MPG on the highway. These figures show the GLC350e’s hybrid nature. City MPG is lower because the gasoline engine works harder in stop-and-go traffic. The highway MPG improves as the electric motor can assist more effectively at constant speeds. However, remember these are test figures. Your results will vary widely depending on how often you charge the battery. Drive mostly on electric power and your gas mileage will skyrocket. Neglect to plug it in, and that 25 MPG combined figure will quickly become an optimistic dream.

Annual fuel cost

According to the EPA, the estimated annual fuel cost for the 2020 Mercedes-Benz GLC350e 4matic is $2,300. This figure is based on driving 15,000 miles per year and assumes national average fuel prices. It’s important to understand how this number is derived. If you drive significantly less than 15,000 miles annually, or if fuel prices in your area are substantially higher or lower than the national average, your actual fuel costs will differ. This assumes mixed driving habits; maximizing electric-only miles can drastically reduce this annual expenditure.

Real-world expectations

Real-world MPG for the GLC350e depends on charging habits. If you consistently plug in and use the electric range, you can significantly beat the EPA combined estimate. However, treat it like a standard hybrid, and you’ll likely see numbers in the low- to mid-20s. Aggressive driving will further penalize fuel economy. This vehicle’s nine-speed automatic transmission usually keeps the engine in its sweet spot, but heavy acceleration can negate its benefits. The weight of the battery pack also impacts efficiency when the electric motor isn’t engaged. Ultimately, the GLC350e’s fuel economy is largely driver-dependent. See GLC350E MPG across all years for further insights.

How it compares

Compared to other luxury plug-in hybrid SUVs, the GLC350e finds itself in the middle of the pack. The BMW X3 xDrive30e, for example, offers a similar combined MPG, often hovering around 24 MPG in real-world testing. The Volvo XC60 Recharge generally delivers slightly better figures, occasionally reaching close to 27 MPG combined. However, its distinct driving feel is quite different than what the Mercedes-Benz offers. Traditional non-hybrid SUVs like the Acura RDX will often struggle to average over 23 MPG combined, highlighting the GLC350e’s advantage when the electric motor is used. The choice ultimately comes down to priorities: are you willing to sacrifice a bit of MPG for the Mercedes-Benz driving experience and brand image? Or is peak efficiency the overriding concern?

Tips to maximize efficiency

Prioritize charging the GLC350e whenever possible. Even short charging sessions can add valuable electric range, reducing your reliance on gasoline. Make having a home charger a priority for the biggest MPG gains.

Use the GLC350e’s driving modes effectively. The “Electric” mode forces the vehicle to operate solely on electric power until the battery is depleted. “Hybrid” mode intelligently manages the gasoline engine and electric motor for optimal efficiency. Don’t overlook the user manual!

Practice smooth acceleration and braking. Jerky movements waste energy. Gently accelerate from stops and anticipate traffic flow to minimize hard braking. Regenerative braking, common in hybrid systems, recovers energy during deceleration, further boosting efficiency.

Maintain proper tire inflation. Underinflated tires increase rolling resistance, which decreases fuel economy. Check your tire pressure regularly and inflate them to the recommended levels found on the driver’s side doorjamb. Find all Mercedes Benz fuel economy data in our MPG database.

Minimize unnecessary weight in the vehicle. Extra weight adds to the engine’s workload, reducing MPG. Remove any items you don’t need from the trunk and passenger area. Lighten the load; save at the pump.