2015 Porsche 911 Carrera 4 GTS Cabriolet MPG and Fuel Economy

On this page, you will find a complete guide to the miles per gallon and fuel efficiency data for the 2015 Porsche 911 Carrera 4 GTS Cabriolet.

The 2015 Porsche 911 Carrera 4 GTS Cabriolet has 2 model options: Manual 7-spd 6-cyl, 3.8 L and Automatic (AM-S7) 6-cyl, 3.8 L.

The 2015 Porsche 911 Carrera 4 GTS Cabriolet Manual 7-spd 6-cyl, 3.8 L runs on premium gasoline and is in the Minicompact Cars car class.

The 2015 Porsche 911 Carrera 4 GTS Cabriolet Automatic (AM-S7) 6-cyl, 3.8 L runs on premium gasoline and is in the Minicompact Cars car class.

🛣 How Many Miles per Gallon (MPG) Does a 2015 Porsche 911 Carrera 4 GTS Cabriolet Get?

Across all models, the combined average MPG for the 2015 Porsche 911 Carrera 4 GTS Cabriolet is 21 miles per gallon.

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

Model OptionCombined MPGCity MPGHighway MPG
Manual 7-spd 6-cyl, 3.8 L201825
Automatic (AM-S7) 6-cyl, 3.8 L211825

💵 What is the Average Yearly Fuel Cost for a 2015 Porsche 911 Carrera 4 GTS Cabriolet?

The average fuel costs for all models of the 2015 Porsche 911 Carrera 4 GTS Cabriolet is $3,600.

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 2015 Porsche 911 Carrera 4 GTS Cabriolet to an average vehicle over 5 years, you will spend $6,500 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 7-spd 6-cyl, 3.8 L$3,700spend $7,000 more
Automatic (AM-S7) 6-cyl, 3.8 L$3,500spend $6,000 more

🛢 How Many Barrels of Petroleum Does a 2015 Porsche 911 Carrera 4 GTS Cabriolet Consume?

Across all models, the average number barrels of petroleum that the 2015 Porsche 911 Carrera 4 GTS Cabriolet will consume in one year is 15 barrels.

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

Model OptionBarrels
Manual 7-spd 6-cyl, 3.8 L15
Automatic (AM-S7) 6-cyl, 3.8 L14

💨 How Many Grams of CO2 Does a 2015 Porsche 911 Carrera 4 GTS Cabriolet Emit?

The 2015 Porsche 911 Carrera 4 GTS Cabriolet will emit an average of about 6,525,000 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 223 trees would be needed to offset emissions from the 2015 Porsche 911 Carrera 4 GTS Cabriolet.

Overview

The tables below cover all of the miles per gallon, engine specifications, and emission details we have for the 2 2015 Porsche 911 Carrera 4 GTS Cabriolet model options.

Manual 7-spd 6-cyl, 3.8 L

The table below contains all of the details we have for the 2015 Porsche 911 Carrera 4 GTS Cabriolet Manual 7-spd 6-cyl, 3.8 L:

City MPG18
Highway MPG25
Combined MPG20
Save/Spend vs Average CarSpend $7,000
Fuel Cost$3,700
Fuel Type 1Premium
Barrels of Petroleum15
Grams of CO26,570,000
Trees Needed to Offset313
Drive4-Wheel Drive
Cylinders6
Displacement3.8
TransmissionManual 7-spd
Vehicle ClassMinicompact Cars
Start/Stop?No
Supercharged?No
Turbocharged?No

Automatic (AM-S7) 6-cyl, 3.8 L

The table below contains all of the details we have for the 2015 Porsche 911 Carrera 4 GTS Cabriolet Automatic (AM-S7) 6-cyl, 3.8 L:

City MPG18
Highway MPG25
Combined MPG21
Save/Spend vs Average CarSpend $6,000
Fuel Cost$3,500
Fuel Type 1Premium
Barrels of Petroleum14
Grams of CO26,480,000
Trees Needed to Offset309
Drive4-Wheel Drive
Cylinders6
Displacement3.8
TransmissionAutomatic (AM-S7)
Vehicle ClassMinicompact Cars
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.

  • "2015 Porsche 911 Carrera 4 GTS Cabriolet MPG and Fuel Economy." MPG Buddy. Accessed on January 3, 2026. https://mpgbuddy.com/cars/porsche/911-carrera-4-gts-cabriolet/2015.

  • "2015 Porsche 911 Carrera 4 GTS Cabriolet MPG and Fuel Economy." MPG Buddy, https://mpgbuddy.com/cars/porsche/911-carrera-4-gts-cabriolet/2015. Accessed January 3, 2026.

  • 2015 Porsche 911 Carrera 4 GTS Cabriolet MPG and Fuel Economy. MPG Buddy. Retrieved from https://mpgbuddy.com/cars/porsche/911-carrera-4-gts-cabriolet/2015.