2019 Mercedes-Benz E450 4matic Convertible: MPG and fuel economy

This page collects every fuel-economy figure the EPA publishes for the 2019 Mercedes-Benz E450 4matic Convertible. Below you will find the headline combined, city, and highway MPG, the estimated annual fuel cost at three different driving levels, the tailpipe CO₂ emissions, and a full breakdown of the engine and drivetrain. If you want to know whether this generation got more or less efficient over the years, the year-over-year table further down covers every model year the EPA has rated.

Fuel economy at a glance

These are the EPA's official ratings for the 2019 Mercedes-Benz E450 4matic Convertible. The numbers come from a standardised laboratory test cycle and are the same figures that appear on the window sticker of every new car. Real-world mileage varies with driving style, weather, fuel quality, and how heavily loaded the car is.

Combined MPG is a 55/45 weighted blend of the city and highway test cycles. The EPA uses it as the single number you can compare across the entire dataset, including hybrids and EVs (which use the equivalent MPGe figure).

How the 2019 Mercedes-Benz E450 4matic Convertible compares

The 2019 Mercedes-Benz E450 4matic Convertible returns 22 combined MPG. Cars in the Subcompact Cars class for the same model year average 26.1 MPG, which puts this car behind the class average by about 16%.

The most efficient car in the Subcompact Cars class for the 2019 model year is the BMW i3 at 113 MPG. The bar chart below puts the Mercedes-Benz E450 4matic Convertible alongside the class best and the class average so you can see the full picture.

For broader context, the average new car of the 2019 model year (across all classes) returns 26.8 MPG. Larger vehicles pull the all-cars average down, so do not use that figure on its own to judge a small car or a hybrid. The full list of the most efficient cars of the 2019 model year is on its own page.

Annual fuel cost across driving patterns

The headline annual fuel cost the EPA publishes assumes 15,000 miles of driving per year and a fuel mix of 55% city and 45% highway. The dollar figure is calculated using the EPA's current reference price for premium gasoline, which is $4.61/gallon. EPA updates that reference periodically rather than tracking live pump prices, so treat it as a window-sticker estimate rather than today's pump number.

The table below scales the EPA's number to three common driving patterns. The combined MPG and the reference fuel price stay constant, only the annual mileage changes. To get a current-prices estimate, take your local gas price and multiply by 681.8 gallons (the car's annual consumption at the rated MPG).

Year-over-year MPG for the Mercedes-Benz E450 4matic Convertible

The EPA has rated the Mercedes-Benz E450 4matic Convertible across 5 model years, from 2019 Mercedes-Benz E450 4matic Convertible through 2023 Mercedes-Benz E450 4matic Convertible. The numbers below are the best combined MPG figure the EPA published for each year, which lets you see when the car was at its most efficient and how recent generations stack up.

Combined MPG has stayed in roughly the same range across the run. The peak rating came with the 2021 Mercedes-Benz E450 4matic Convertible at 25 MPG.

Compare against other Subcompact Cars for 2019

If you are cross-shopping the 2019 Mercedes-Benz E450 4matic Convertible, the most useful comparison is against the other cars in the Subcompact Cars class for the same model year. The list below shows the highest-MPG peers, ranked from most to least efficient. Click any of them to open its full page.

The BMW i3 leads this group at 113 MPG, 91 MPG ahead of the 2019 Mercedes-Benz E450 4matic Convertible.

Specifications

The 2019 Mercedes-Benz E450 4matic Convertible runs a 3-liter 6-cylinder turbocharged engine paired with a automatic 9-spd, sending power through 4-wheel drive.

Engine, transmission, and drivetrain together drive most of the variation in fuel economy across trims. A larger engine moves the car with less effort but burns more fuel. A turbo lets a small engine punch above its weight, often without much MPG penalty. All-wheel drive adds traction and weight, and usually costs a couple of MPG compared with two-wheel drive of the same engine.

Vehicle class

Subcompact Cars

Engine

3L 6-cylinder turbocharged

Transmission

Automatic 9-spd

Drivetrain

4-Wheel Drive

Fuel type

Premium

Annual petroleum use

13.5 barrels per year

Start-stop system

Yes

Common questions about the 2019 Mercedes-Benz E450 4matic Convertible

Quick answers to the questions people most often search for when looking up the 2019 Mercedes-Benz E450 4matic Convertible.

• Is the 2019 Mercedes-Benz E450 4matic Convertible fuel efficient?

  Not particularly. The 2019 Mercedes-Benz E450 4matic Convertible returns 22 combined MPG, which trails the average car in the Subcompact Cars class for the same model year by about 16%.
• What MPG does the 2019 Mercedes-Benz E450 4matic Convertible get?

  The EPA rates the 2019 Mercedes-Benz E450 4matic Convertible at 22 combined MPG, 19 MPG in city driving, and 26 MPG on the highway. Real-world numbers depend on your driving style, the weather, and how loaded the car is.
• How much does it cost to fuel a 2019 Mercedes-Benz E450 4matic Convertible per year?

  The EPA estimates an annual fuel cost of $3,150 for the 2019 Mercedes-Benz E450 4matic Convertible. That figure assumes 15,000 miles of driving per year, a 55% city and 45% highway split, and the EPA's published average fuel price for the rated fuel grade.
• Does the 2019 Mercedes-Benz E450 4matic Convertible require premium gas?

  Yes. The EPA lists the 2019 Mercedes-Benz E450 4matic Convertible as requiring premium gasoline. Running it on regular can reduce performance and may affect engine warranties, so it is not a recommended way to save at the pump.
• Has the Mercedes-Benz E450 4matic Convertible become more fuel efficient over time?

  Combined MPG has stayed close to flat across the run. Both the earliest (2019 Mercedes-Benz E450 4matic Convertible, 22 MPG) and most recent (2023 Mercedes-Benz E450 4matic Convertible, 24 MPG) versions sit in the same range.
• How much CO₂ does the 2019 Mercedes-Benz E450 4matic Convertible emit?

  Tailpipe CO₂ emissions are 408 g/mi. Multiplied across a typical year of driving (15,000 miles) that works out to about 6,120 kilograms of CO₂.
• What is the difference between the city and highway MPG of the 2019 Mercedes-Benz E450 4matic Convertible?

  City driving returns 19 MPG and highway driving returns 26 MPG, a gap of 7 MPG. A spread that wide is typical of cars with conventional automatic or manual transmissions, where stop-start city traffic eats more fuel than a steady highway cruise.
• What engine is in the 2019 Mercedes-Benz E450 4matic Convertible?

  The 2019 Mercedes-Benz E450 4matic Convertible has a 3-liter 6-cylinder turbocharged engine (EPA description: SIDI).
• What transmission and drivetrain does the 2019 Mercedes-Benz E450 4matic Convertible have?

  The 2019 Mercedes-Benz E450 4matic Convertible comes with a automatic 9-spd transmission and 4-wheel drive.
• How does the 2019 Mercedes-Benz E450 4matic Convertible compare to the best car in its class?

  The most efficient car in the Subcompact Cars class for the 2019 model year is the BMW i3 at 113 combined MPG. The Mercedes-Benz E450 4matic Convertible returns 22 MPG, a gap of 91 MPG. If you are comparing on fuel economy alone, the class leader is worth a look.

Source: U.S. EPA fuel economy dataset. Annual fuel cost figures assume 15,000 miles of driving per year and a 55% city, 45% highway split. Real-world mileage varies with driving conditions, vehicle maintenance, fuel quality, and driver behaviour.