The 2019 Mercedes-Benz E450 4Matic Convertible achieves 22 MPG combined. This might seem high compared to a hybrid, but it’s a reasonable trade-off for open-top driving, a smooth turbocharged six-cylinder engine, and the all-weather capability of 4Matic all-wheel drive. This car isn’t about maximizing fuel efficiency; it’s designed for a specific driving experience.

City and highway performance

The EPA estimates 19 MPG in the city and 26 MPG on the highway. The city number reflects the fuel demands of stop-and-go traffic where the 3.0L engine and nine-speed automatic are constantly modulating. Highway fuel economy is better because the engine settles into its stride, the smooth-shifting transmission finds its optimal gear, and the E-Class design is inherently aerodynamic, even with convertible compromises. Expect the highway figure to decrease and get closer to the city number if you frequently drive at high speeds and aggressively use the throttle.

Annual fuel cost

The EPA calculates the annual fuel cost for the 2019 Mercedes-Benz E450 4Matic Convertible at $2,650. This estimate assumes 15,000 miles per year and national average fuel prices. Premium fuel is recommended (if not required), which increases that figure compared to vehicles that run on regular gasoline. Your fuel costs will vary if your yearly mileage is significantly higher or lower than 15,000, or if gasoline prices in your area are markedly different from the national average.

Real-world expectations

The E450 convertible driver probably cares more about performance, luxury, and open-air enjoyment than maximizing MPGs. Fuel consumption will vary based on driving style, road conditions, and how often you drive with the top down. Expect to see numbers close to the EPA estimates during normal use. They will likely dip when you drive aggressively and potentially exceed them slightly on long, gentle highway trips. Drivers who often use the engine’s full power or primarily drive short distances in heavy traffic will likely see lower MPG figures. Check E450 MPG across all years to see how the 2019 model compares.

How it compares

The 2019 Mercedes-Benz E450 4Matic Convertible’s fuel economy is about average compared to other similar vehicles. The BMW 440i xDrive Convertible (discontinued after 2020), for example, had similar performance and all-wheel drive, but slightly better EPA-estimated fuel economy at 25 MPG combined. The Audi S5 Cabriolet, with its turbocharged V6, also tends to achieve around 24 MPG combined. On the other hand, larger, more powerful convertibles like the Mercedes-AMG C43 Cabriolet typically see combined MPG figures in the high teens because their performance is more important. Buyers will need to decide if a small fuel economy advantage is worth more than the driving experience of the Mercedes-Benz. See all Mercedes Benz fuel economy data for more models.

Tips to maximize efficiency

The E450’s nine-speed automatic transmission shifts early and often to improve fuel economy. Let it do what it’s designed to do. Avoid aggressive acceleration from a standstill, allowing the transmission to gradually shift through the gears.

Mercedes-Benz recommends premium fuel for the E450. While using regular gasoline might seem like a good way to save money, it could negatively impact performance and fuel economy. Using premium ensures the engine works efficiently.

Regular maintenance is important for getting good fuel economy. Properly inflated tires, clean air filters, and timely oil changes help the engine run smoother and reduce fuel consumption. Follow the manufacturer’s recommended maintenance schedule to keep the E450 running efficiently.

Reduce unnecessary weight in the vehicle. Remove non-essential items from the trunk and passenger compartment. Excess weight makes the engine work harder, leading to higher fuel consumption, so travel as light as you can.

Plan your trips to be efficient. Combine errands into a single trip to minimize cold starts, which use more fuel. Avoid peak traffic hours to reduce stop-and-go driving, which significantly affects fuel economy.