23 MPG combined isn’t going to win any hypermiling contests, but for the 2017 Mercedes-Benz E400 4matic Coupe, it’s an acceptable trade-off for the style, performance, and all-weather confidence this car delivers. The E400 Coupe appeals to a specific buyer: one who appreciates refined design, responsive power, and the added security of all-wheel drive, even if it means using more gas. They’re buying an experience, and the fuel bill is a secondary consideration.

City and highway performance

The E400 Coupe’s EPA ratings are 20 MPG in the city and 28 MPG on the highway. The city figure reflects the demands placed on the 3.0-liter twin-turbo V6 during stop-and-go traffic. The eager throttle response and the temptation to exploit the engine’s readily available torque will lower fuel economy in urban environments. On the open road, the E400 Coupe shines. The 7-speed automatic transmission shifts smoothly, and the overdrive ratios help to keep the engine relaxed at cruising speeds, leading to better highway MPG. That 28 MPG allows for relaxed long-distance cruising, which is in line with the car’s grand touring mission.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2017 Mercedes-Benz E400 4matic Coupe at $2,500. This is based on driving 15,000 miles per year and using national average fuel prices. Individual fuel costs will vary depending on driving habits and local gas prices, but this $2,500 estimate provides a benchmark for potential buyers to understand the ongoing expense of owning this vehicle. Drivers who primarily operate their E400 in the city, or those with a heavier foot, should expect to spend more. Drivers who primarily take highway trips, and who practice economical driving techniques, may find their actual fuel costs are lower than the EPA estimate. You can research all Mercedes Benz fuel economy data to see how other models compare.

Real-world expectations

The EPA provides a standardized test, but real-world fuel economy changes. Drivers who frequently accelerate quickly, or spend most of their time in congested urban centers, will likely see MPG figures below the official ratings. Drivers who accelerate smoothly, anticipate traffic flow, and maximize highway driving, may find they achieve numbers closer to, or slightly exceeding, the EPA estimates. Tire pressure, vehicle maintenance, and weather conditions affect overall fuel economy.

How it compares

The 2017 E400 Coupe’s 23 MPG combined rating positions it within a specific segment of luxury coupes. For comparison, the similarly equipped BMW 440i xDrive Coupe from the same year, with a turbocharged inline-6, achieved an EPA rating of 25 MPG combined, a slight advantage in fuel efficiency. The Audi A5 Coupe Quattro with its turbocharged 2.0-liter engine, delivered about 24 MPG combined, balancing fuel economy and performance. These differences matter to buyers who are closely watching running costs, performance and luxury. Exploring E400 MPG across all years can provide a broader perspective.

Tips to maximize efficiency

Use the E400 Coupe’s “Eco” driving mode whenever possible. This mode alters the engine and transmission mapping to prioritize fuel efficiency, which makes it ideal for leisurely cruising and stop-and-go traffic. While it might slightly reduce throttle response, it can make a difference in overall fuel consumption without drastically altering the driving experience.

Make sure your E400’s tires are properly inflated to the recommended pressure, which can be found on the driver’s side doorjamb. Underinflated tires increase rolling resistance, forcing the engine to work harder and reducing fuel economy. Regularly checking and adjusting tire pressure is a simple way to improve MPG.

Anticipate traffic flow and maintain a smooth, consistent speed. Avoid abrupt acceleration and braking, as these actions increase fuel consumption significantly. By looking ahead and planning your maneuvers, you can minimize unnecessary energy expenditure and optimize fuel efficiency, especially in urban driving.

Reduce unnecessary weight inside the vehicle. Carrying extra cargo adds to the car’s overall mass, requiring more energy to accelerate and maintain speed. Removing items you don’t need, from golf clubs to unnecessary personal belongings, can improve fuel economy.

Consider using cruise control on long highway drives. Cruise control helps maintain a consistent speed, minimizing variations in throttle position and reducing fuel consumption. This is effective on relatively flat stretches of road, where the system can maintain a steady pace with minimal adjustments for maximizing fuel efficiency during highway commutes.