25 MPG combined in the 2023 Mercedes-Benz E450 Convertible isn’t winning any green awards, but it’s a reasonable trade-off for the open-air experience and effortless performance this car provides. This isn’t about hypermiling; it’s about enjoying a driving experience with the top down, and accepting that a certain fuel cost comes with the territory.

City and highway performance

The EPA estimates the E450 Convertible’s fuel economy at 22 MPG in the city and 29 MPG on the highway. The city figure reflects stop-and-go traffic, where the car’s weight and occasional bursts of acceleration take their toll. Out on the open road, the 9-speed automatic transmission allows the engine to cruise comfortably at lower RPMs, contributing to the decent highway number. Remember that enjoying the car’s strong power with frequent passing maneuvers will invariably pull that highway MPG downward.

Annual fuel cost

Based on the EPA’s estimate of 15,000 miles driven per year and national average fuel prices, the annual fuel cost for the 2023 Mercedes-Benz E450 Convertible is $2,300. Bear in mind this is an estimate. Drivers covering fewer miles or those who live in areas with lower fuel prices will likely spend less. Those with longer commutes or lead foots will spend significantly more. The EPA derives this fuel cost, but drivers will have their own individual numbers.

Real-world expectations

While the EPA figures provide a baseline, real-world fuel economy will vary. The E450 Convertible is often purchased as a weekend cruiser or for occasional top-down drives. Short trips around town will likely yield MPG figures closer to the city estimate, while longer highway journeys, especially with minimal traffic, might approach or even slightly exceed the EPA highway number. Driving style plays a significant role. The car’s turbocharged engine is responsive, and enjoying its performance will inevitably impact fuel consumption. Frequent use of Sport mode will also lower fuel efficiency.

How it compares

Compared to its rivals, the E450 Convertible’s fuel economy is competitive, but not class-leading. For example, the BMW 4 Series Convertible with its base engine achieves around 28 MPG combined. Stepping up to the more powerful M440i version brings the MPG closer to the E450. The Audi A5 Cabriolet returns nearly identical fuel economy. Ultimately, these buyers aren’t prioritizing ultimate MPG figures; they want the open top experience and luxurious appointments that these cars provide. Shoppers concerned with making comparisons can consult E450 MPG across all years to see how this model has evolved.

Tips to maximize efficiency

While the E450 Convertible isn’t designed for hypermiling, some strategies can help optimize fuel economy in everyday driving. Ensure your tires are properly inflated to the recommended pressure, which reduces rolling resistance and improves MPG. This is particularly important on a heavier car like the E450.

Avoid excessive idling. The engine consumes fuel even when the car is stationary. Turn off the engine if you expect to be stopped for more than a minute or two. This simple habit can add up to a noticeable difference over time.

Use cruise control on the highway whenever possible. Maintaining a consistent speed helps minimize unnecessary acceleration and braking, leading to better fuel efficiency. Avoid aggressive acceleration and hard braking, as these actions consume more fuel. Smooth, gradual acceleration is key.

Consider using the “Comfort” or “Eco” driving modes. These modes typically adjust the engine and transmission settings to prioritize fuel efficiency over performance. While they might not be as engaging as the “Sport” mode, they can help you save fuel on longer journeys.

Regular maintenance is critical for optimal fuel economy. Ensure your car’s engine is properly tuned and that the air filter is clean. A well-maintained engine runs more efficiently and consumes less fuel while allowing drivers to consider all Mercedes Benz fuel economy data when making their decisions.