2003 Mercedes-Benz S430 4matic: MPG and fuel economy

This page collects every fuel-economy figure the EPA publishes for the 2003 Mercedes-Benz S430 4matic. 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 2003 Mercedes-Benz S430 4matic. 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 2003 Mercedes-Benz S430 4matic compares

The 2003 Mercedes-Benz S430 4matic returns 17 combined MPG. Cars in the Large Cars class for the same model year average 17.9 MPG, which puts this car behind the class average by about 5%.

The most efficient car in the Large Cars class for the 2003 model year is the Chevrolet Impala at 22 MPG. The bar chart below puts the Mercedes-Benz S430 4matic alongside the class best and the class average so you can see the full picture.

For broader context, the average new car of the 2003 model year (across all classes) returns 18.4 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 2003 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 882.4 gallons (the car's annual consumption at the rated MPG).

Year-over-year MPG for the Mercedes-Benz S430 4matic

The EPA has rated the Mercedes-Benz S430 4matic across 4 model years, from 2003 Mercedes-Benz S430 4matic through 2006 Mercedes-Benz S430 4matic. 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, hovering close to 17 MPG.

Compare against other Large Cars for 2003

If you are cross-shopping the 2003 Mercedes-Benz S430 4matic, the most useful comparison is against the other cars in the Large 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 Chevrolet Impala leads this group at 22 MPG, 5 MPG ahead of the 2003 Mercedes-Benz S430 4matic.

Specifications

The 2003 Mercedes-Benz S430 4matic runs a 4.3-liter 8-cylinder engine paired with a automatic 5-spd, sending power through 4-wheel or all-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

Large Cars

Engine

4.3L 8-cylinder

Transmission

Automatic 5-spd

Drivetrain

4-Wheel or All-Wheel Drive

Fuel type

Premium

Annual petroleum use

17.5 barrels per year

Gas guzzler tax

Applies (federal)

Common questions about the 2003 Mercedes-Benz S430 4matic

Quick answers to the questions people most often search for when looking up the 2003 Mercedes-Benz S430 4matic.

• Is the 2003 Mercedes-Benz S430 4matic fuel efficient?

  It is in line with the rest of the class. The 2003 Mercedes-Benz S430 4matic returns 17 combined MPG, and the average car in the Large Cars class for the same model year sits at 17.9 MPG.
• What MPG does the 2003 Mercedes-Benz S430 4matic get?

  The EPA rates the 2003 Mercedes-Benz S430 4matic at 17 combined MPG, 15 MPG in city driving, and 20 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 2003 Mercedes-Benz S430 4matic per year?

  The EPA estimates an annual fuel cost of $4,050 for the 2003 Mercedes-Benz S430 4matic. 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 2003 Mercedes-Benz S430 4matic require premium gas?

  Yes. The EPA lists the 2003 Mercedes-Benz S430 4matic 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 S430 4matic become more fuel efficient over time?

  Combined MPG has stayed close to flat across the run. Both the earliest (2003 Mercedes-Benz S430 4matic, 17 MPG) and most recent (2006 Mercedes-Benz S430 4matic, 17 MPG) versions sit in the same range.
• How much CO₂ does the 2003 Mercedes-Benz S430 4matic emit?

  Tailpipe CO₂ emissions are 523 g/mi. Multiplied across a typical year of driving (15,000 miles) that works out to about 7,841 kilograms of CO₂.
• What is the difference between the city and highway MPG of the 2003 Mercedes-Benz S430 4matic?

  City driving returns 15 MPG and highway driving returns 20 MPG, a gap of 5 MPG. The two figures are close enough that the car will hold its rated efficiency well across most driving patterns.
• What engine is in the 2003 Mercedes-Benz S430 4matic?

  The 2003 Mercedes-Benz S430 4matic has a 4.3-liter 8-cylinder engine (EPA description: GUZZLER).
• What transmission and drivetrain does the 2003 Mercedes-Benz S430 4matic have?

  The 2003 Mercedes-Benz S430 4matic comes with a automatic 5-spd transmission and 4-wheel or all-wheel drive. All-wheel-drive variants typically read 1 to 3 MPG lower than the front-wheel-drive equivalent of the same engine, since the extra hardware adds weight and parasitic loss.
• How does the 2003 Mercedes-Benz S430 4matic compare to the best car in its class?

  The most efficient car in the Large Cars class for the 2003 model year is the Chevrolet Impala at 22 combined MPG. The Mercedes-Benz S430 4matic returns 17 MPG, a gap of 5 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.