2003 Mercedes-Benz SLK320 MPG and Fuel Economy

On this page, you will find a complete guide to the miles per gallon and fuel efficiency data for the 2003 Mercedes-Benz SLK320.

The 2003 Mercedes-Benz SLK320 has 2 model options: Automatic 5-spd 6-cyl, 3.2 L and Manual 6-spd 6-cyl, 3.2 L.

The 2003 Mercedes-Benz SLK320 Automatic 5-spd 6-cyl, 3.2 L runs on premium gasoline and is in the Two Seaters car class.

The 2003 Mercedes-Benz SLK320 Manual 6-spd 6-cyl, 3.2 L runs on premium gasoline and is in the Two Seaters car class.

🛣 How Many Miles per Gallon (MPG) Does a 2003 Mercedes-Benz SLK320 Get?

Across all models, the combined average MPG for the 2003 Mercedes-Benz SLK320 is 19 miles per gallon.

The table below breaks down the MPG for each model option:

Model OptionCombined MPGCity MPGHighway MPG
Automatic 5-spd 6-cyl, 3.2 L201824
Manual 6-spd 6-cyl, 3.2 L181524

💵 What is the Average Yearly Fuel Cost for a 2003 Mercedes-Benz SLK320?

The average fuel costs for all models of the 2003 Mercedes-Benz SLK320 is $3,900.

The average fuel costs have been estimated by government regulators based on 15,000 miles driven per year, using regular gasoline, and a split of 55% city driving and 45% highway driving.

Comparing a 2003 Mercedes-Benz SLK320 to an average vehicle over 5 years, you will spend $8,000 more on fuel.

The table below shows the fuel costs and 5-year save/spend for each model option:

Model OptionFuel Cost5-Year Save/Spend
Automatic 5-spd 6-cyl, 3.2 L$3,700spend $7,000 more
Manual 6-spd 6-cyl, 3.2 L$4,100spend $9,000 more

🛢 How Many Barrels of Petroleum Does a 2003 Mercedes-Benz SLK320 Consume?

Across all models, the average number barrels of petroleum that the 2003 Mercedes-Benz SLK320 will consume in one year is 16 barrels.

The majority of the world's petroleum is sourced from countries like Saudi Arabia, Russia, Iraq, and the United States.

Model OptionBarrels
Automatic 5-spd 6-cyl, 3.2 L15
Manual 6-spd 6-cyl, 3.2 L17

💨 How Many Grams of CO2 Does a 2003 Mercedes-Benz SLK320 Emit?

The 2003 Mercedes-Benz SLK320 will emit an average of about -15,000 grams of CO2 per year.

🌳 To help you understand the impact of this, a normal tree will absorb around 21,000 grams of CO2 per year. This means that roughly 1 tree would be needed to offset emissions from the 2003 Mercedes-Benz SLK320.

Overview

The tables below cover all of the miles per gallon, engine specifications, and emission details we have for the 2 2003 Mercedes-Benz SLK320 model options.

Automatic 5-spd 6-cyl, 3.2 L

The table below contains all of the details we have for the 2003 Mercedes-Benz SLK320 Automatic 5-spd 6-cyl, 3.2 L:

City MPG18
Highway MPG24
Combined MPG20
Save/Spend vs Average CarSpend $7,000
Fuel Cost$3,700
Fuel Type 1Premium
Barrels of Petroleum15
Grams of CO2-15,000
Trees Needed to Offset-1
DriveRear-Wheel Drive
Cylinders6
Displacement3.2
TransmissionAutomatic 5-spd
Vehicle ClassTwo Seaters
Start/Stop?No
Supercharged?No
Turbocharged?No

Manual 6-spd 6-cyl, 3.2 L

The table below contains all of the details we have for the 2003 Mercedes-Benz SLK320 Manual 6-spd 6-cyl, 3.2 L:

City MPG15
Highway MPG24
Combined MPG18
Save/Spend vs Average CarSpend $9,000
Fuel Cost$4,100
Fuel Type 1Premium
Barrels of Petroleum17
Grams of CO2-15,000
Trees Needed to Offset-1
DriveRear-Wheel Drive
Cylinders6
Displacement3.2
TransmissionManual 6-spd
Vehicle ClassTwo Seaters
Start/Stop?No
Supercharged?No
Turbocharged?No

Link To or Reference This Page

If you use this page in your research, please reference MPG Buddy as the source.

  • "2003 Mercedes-Benz SLK320 MPG and Fuel Economy." MPG Buddy. Accessed on January 3, 2026. https://mpgbuddy.com/cars/mercedes-benz/slk320/2003.

  • "2003 Mercedes-Benz SLK320 MPG and Fuel Economy." MPG Buddy, https://mpgbuddy.com/cars/mercedes-benz/slk320/2003. Accessed January 3, 2026.

  • 2003 Mercedes-Benz SLK320 MPG and Fuel Economy. MPG Buddy. Retrieved from https://mpgbuddy.com/cars/mercedes-benz/slk320/2003.