2020 Porsche Boxster S MPG and Fuel Economy

On this page, you will find a complete guide to the miles per gallon and fuel efficiency data for the 2020 Porsche Boxster S.

The 2020 Porsche Boxster S has 2 model options: Manual 6-spd 4-cyl, 2.5 L and Automatic (AM-S7) 4-cyl, 2.5 L.

The 2020 Porsche Boxster S Manual 6-spd 4-cyl, 2.5 L runs on premium gasoline and is in the Two Seaters car class.

The 2020 Porsche Boxster S Automatic (AM-S7) 4-cyl, 2.5 L runs on premium gasoline and is in the Two Seaters car class.

🛣 How Many Miles per Gallon (MPG) Does a 2020 Porsche Boxster S Get?

Across all models, the combined average MPG for the 2020 Porsche Boxster S is 22 miles per gallon.

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

Model OptionCombined MPGCity MPGHighway MPG
Manual 6-spd 4-cyl, 2.5 L211924
Automatic (AM-S7) 4-cyl, 2.5 L221925

💵 What is the Average Yearly Fuel Cost for a 2020 Porsche Boxster S?

The average fuel costs for all models of the 2020 Porsche Boxster S is $3,425.

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 2020 Porsche Boxster S to an average vehicle over 5 years, you will spend $5,625 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
Manual 6-spd 4-cyl, 2.5 L$3,500spend $6,000 more
Automatic (AM-S7) 4-cyl, 2.5 L$3,350spend $5,250 more

🛢 How Many Barrels of Petroleum Does a 2020 Porsche Boxster S Consume?

Across all models, the average number barrels of petroleum that the 2020 Porsche Boxster S will consume in one year is 14 barrels.

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

Model OptionBarrels
Manual 6-spd 4-cyl, 2.5 L14
Automatic (AM-S7) 4-cyl, 2.5 L14

💨 How Many Grams of CO2 Does a 2020 Porsche Boxster S Emit?

The 2020 Porsche Boxster S will emit an average of about 6,247,500 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 213 trees would be needed to offset emissions from the 2020 Porsche Boxster S.

Overview

The tables below cover all of the miles per gallon, engine specifications, and emission details we have for the 2 2020 Porsche Boxster S model options.

Manual 6-spd 4-cyl, 2.5 L

The table below contains all of the details we have for the 2020 Porsche Boxster S Manual 6-spd 4-cyl, 2.5 L:

City MPG19
Highway MPG24
Combined MPG21
Save/Spend vs Average CarSpend $6,000
Fuel Cost$3,500
Fuel Type 1Premium
Barrels of Petroleum14
Grams of CO26,345,000
Trees Needed to Offset302
DriveRear-Wheel Drive
Cylinders4
Displacement2.5
TransmissionManual 6-spd
Vehicle ClassTwo Seaters
Start/Stop?Yes
Supercharged?No
Turbocharged?Yes

Automatic (AM-S7) 4-cyl, 2.5 L

The table below contains all of the details we have for the 2020 Porsche Boxster S Automatic (AM-S7) 4-cyl, 2.5 L:

City MPG19
Highway MPG25
Combined MPG22
Save/Spend vs Average CarSpend $5,250
Fuel Cost$3,350
Fuel Type 1Premium
Barrels of Petroleum14
Grams of CO26,150,000
Trees Needed to Offset293
DriveRear-Wheel Drive
Cylinders4
Displacement2.5
TransmissionAutomatic (AM-S7)
Vehicle ClassTwo Seaters
Start/Stop?Yes
Supercharged?No
Turbocharged?Yes

Link To or Reference This Page

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

  • "2020 Porsche Boxster S MPG and Fuel Economy." MPG Buddy. Accessed on January 3, 2026. https://mpgbuddy.com/cars/porsche/boxster-s/2020.

  • "2020 Porsche Boxster S MPG and Fuel Economy." MPG Buddy, https://mpgbuddy.com/cars/porsche/boxster-s/2020. Accessed January 3, 2026.

  • 2020 Porsche Boxster S MPG and Fuel Economy. MPG Buddy. Retrieved from https://mpgbuddy.com/cars/porsche/boxster-s/2020.