2012 Mazda 3 DI 5-Door MPG and Fuel Economy

On this page, you will find a complete guide to the miles per gallon and fuel efficiency data for the 2012 Mazda 3 DI 5-Door.

The 2012 Mazda 3 DI 5-Door has 2 model options: Manual 6-spd 4-cyl, 2.0 L and Automatic (S6) 4-cyl, 2.0 L.

The 2012 Mazda 3 DI 5-Door Manual 6-spd 4-cyl, 2.0 L runs on regular gasoline and is in the Midsize Cars car class.

The 2012 Mazda 3 DI 5-Door Automatic (S6) 4-cyl, 2.0 L runs on regular gasoline and is in the Midsize Cars car class.

🛣 How Many Miles per Gallon (MPG) Does a 2012 Mazda 3 DI 5-Door Get?

Across all models, the combined average MPG for the 2012 Mazda 3 DI 5-Door is 31 miles per gallon.

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

Model OptionCombined MPGCity MPGHighway MPG
Manual 6-spd 4-cyl, 2.0 L302637
Automatic (S6) 4-cyl, 2.0 L312837

💵 What is the Average Yearly Fuel Cost for a 2012 Mazda 3 DI 5-Door?

The average fuel costs for all models of the 2012 Mazda 3 DI 5-Door is $2,050.

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 2012 Mazda 3 DI 5-Door to an average vehicle over 5 years, you will save $1,250 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, 2.0 L$2,100save $1,000
Automatic (S6) 4-cyl, 2.0 L$2,000save $1,500

🛢 How Many Barrels of Petroleum Does a 2012 Mazda 3 DI 5-Door Consume?

Across all models, the average number barrels of petroleum that the 2012 Mazda 3 DI 5-Door will consume in one year is 10 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, 2.0 L10
Automatic (S6) 4-cyl, 2.0 L10

💨 How Many Grams of CO2 Does a 2012 Mazda 3 DI 5-Door Emit?

The 2012 Mazda 3 DI 5-Door 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 2012 Mazda 3 DI 5-Door.

Overview

The tables below cover all of the miles per gallon, engine specifications, and emission details we have for the 2 2012 Mazda 3 DI 5-Door model options.

Manual 6-spd 4-cyl, 2.0 L

The table below contains all of the details we have for the 2012 Mazda 3 DI 5-Door Manual 6-spd 4-cyl, 2.0 L:

City MPG26
Highway MPG37
Combined MPG30
Save/Spend vs Average CarSave $1,000
Fuel Cost$2,100
Fuel Type 1Regular
Barrels of Petroleum10
Grams of CO2-15,000
Trees Needed to Offset-1
DriveFront-Wheel Drive
Cylinders4
Displacement2
TransmissionManual 6-spd
Vehicle ClassMidsize Cars
Start/Stop?No
Supercharged?No
Turbocharged?No

Automatic (S6) 4-cyl, 2.0 L

The table below contains all of the details we have for the 2012 Mazda 3 DI 5-Door Automatic (S6) 4-cyl, 2.0 L:

City MPG28
Highway MPG37
Combined MPG31
Save/Spend vs Average CarSave $1,500
Fuel Cost$2,000
Fuel Type 1Regular
Barrels of Petroleum10
Grams of CO2-15,000
Trees Needed to Offset-1
DriveFront-Wheel Drive
Cylinders4
Displacement2
TransmissionAutomatic (S6)
Vehicle ClassMidsize 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.

  • "2012 Mazda 3 DI 5-Door MPG and Fuel Economy." MPG Buddy. Accessed on January 3, 2026. https://mpgbuddy.com/cars/mazda/3-di-5-door/2012.

  • "2012 Mazda 3 DI 5-Door MPG and Fuel Economy." MPG Buddy, https://mpgbuddy.com/cars/mazda/3-di-5-door/2012. Accessed January 3, 2026.

  • 2012 Mazda 3 DI 5-Door MPG and Fuel Economy. MPG Buddy. Retrieved from https://mpgbuddy.com/cars/mazda/3-di-5-door/2012.