2018 Mazda 3 4-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 2018 Mazda 3 4-Door.
The 2018 Mazda 3 4-Door has 4 model options: Manual 6-spd 4-cyl, 2.0 L, Automatic (S6) 4-cyl, 2.0 L, Automatic (S6) 4-cyl, 2.5 L and Manual 6-spd 4-cyl, 2.5 L.
The 2018 Mazda 3 4-Door Manual 6-spd 4-cyl, 2.0 L runs on regular gasoline and is in the Compact Cars car class.
The 2018 Mazda 3 4-Door Automatic (S6) 4-cyl, 2.0 L runs on regular gasoline and is in the Compact Cars car class.
The 2018 Mazda 3 4-Door Automatic (S6) 4-cyl, 2.5 L runs on regular gasoline and is in the Compact Cars car class.
The 2018 Mazda 3 4-Door Manual 6-spd 4-cyl, 2.5 L runs on regular gasoline and is in the Compact Cars car class.
🛣 How Many Miles per Gallon (MPG) Does a 2018 Mazda 3 4-Door Get?
Across all models, the combined average MPG for the 2018 Mazda 3 4-Door is 30 miles per gallon.
The table below breaks down the MPG for each model option:
| Model Option | Combined MPG | City MPG | Highway MPG |
|---|---|---|---|
| Manual 6-spd 4-cyl, 2.0 L | 31 | 28 | 38 |
| Automatic (S6) 4-cyl, 2.0 L | 31 | 28 | 37 |
| Automatic (S6) 4-cyl, 2.5 L | 30 | 27 | 36 |
| Manual 6-spd 4-cyl, 2.5 L | 29 | 25 | 34 |
💵 What is the Average Yearly Fuel Cost for a 2018 Mazda 3 4-Door?
The average fuel costs for all models of the 2018 Mazda 3 4-Door is $2,063.
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 2018 Mazda 3 4-Door to an average vehicle over 5 years, you will save $1,188 on fuel.
The table below shows the fuel costs and 5-year save/spend for each model option:
| Model Option | Fuel Cost | 5-Year Save/Spend |
|---|---|---|
| Manual 6-spd 4-cyl, 2.0 L | $2,000 | save $1,500 |
| Automatic (S6) 4-cyl, 2.0 L | $2,000 | save $1,500 |
| Automatic (S6) 4-cyl, 2.5 L | $2,100 | save $1,000 |
| Manual 6-spd 4-cyl, 2.5 L | $2,150 | save $750 |
🛢 How Many Barrels of Petroleum Does a 2018 Mazda 3 4-Door Consume?
Across all models, the average number barrels of petroleum that the 2018 Mazda 3 4-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 Option | Barrels |
|---|---|
| Manual 6-spd 4-cyl, 2.0 L | 10 |
| Automatic (S6) 4-cyl, 2.0 L | 10 |
| Automatic (S6) 4-cyl, 2.5 L | 10 |
| Manual 6-spd 4-cyl, 2.5 L | 10 |
💨 How Many Grams of CO2 Does a 2018 Mazda 3 4-Door Emit?
The 2018 Mazda 3 4-Door will emit an average of about 4,383,750 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 150 trees would be needed to offset emissions from the 2018 Mazda 3 4-Door.
Overview
The tables below cover all of the miles per gallon, engine specifications, and emission details we have for the 4 2018 Mazda 3 4-Door model options.
Manual 6-spd 4-cyl, 2.0 L
The table below contains all of the details we have for the 2018 Mazda 3 4-Door Manual 6-spd 4-cyl, 2.0 L:
| City MPG | 28 |
|---|---|
| Highway MPG | 38 |
| Combined MPG | 31 |
| Save/Spend vs Average Car | Save $1,500 |
| Fuel Cost | $2,000 |
| Fuel Type 1 | Regular |
| Barrels of Petroleum | 10 |
| Grams of CO2 | 4,215,000 |
| Trees Needed to Offset | 201 |
| Drive | Front-Wheel Drive |
| Cylinders | 4 |
| Displacement | 2 |
| Transmission | Manual 6-spd |
| Vehicle Class | Compact 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 2018 Mazda 3 4-Door Automatic (S6) 4-cyl, 2.0 L:
| City MPG | 28 |
|---|---|
| Highway MPG | 37 |
| Combined MPG | 31 |
| Save/Spend vs Average Car | Save $1,500 |
| Fuel Cost | $2,000 |
| Fuel Type 1 | Regular |
| Barrels of Petroleum | 10 |
| Grams of CO2 | 4,245,000 |
| Trees Needed to Offset | 202 |
| Drive | Front-Wheel Drive |
| Cylinders | 4 |
| Displacement | 2 |
| Transmission | Automatic (S6) |
| Vehicle Class | Compact Cars |
| Start/Stop? | No |
| Supercharged? | No |
| Turbocharged? | No |
Automatic (S6) 4-cyl, 2.5 L
The table below contains all of the details we have for the 2018 Mazda 3 4-Door Automatic (S6) 4-cyl, 2.5 L:
| City MPG | 27 |
|---|---|
| Highway MPG | 36 |
| Combined MPG | 30 |
| Save/Spend vs Average Car | Save $1,000 |
| Fuel Cost | $2,100 |
| Fuel Type 1 | Regular |
| Barrels of Petroleum | 10 |
| Grams of CO2 | 4,395,000 |
| Trees Needed to Offset | 209 |
| Drive | Front-Wheel Drive |
| Cylinders | 4 |
| Displacement | 2.5 |
| Transmission | Automatic (S6) |
| Vehicle Class | Compact Cars |
| Start/Stop? | No |
| Supercharged? | No |
| Turbocharged? | No |
Manual 6-spd 4-cyl, 2.5 L
The table below contains all of the details we have for the 2018 Mazda 3 4-Door Manual 6-spd 4-cyl, 2.5 L:
| City MPG | 25 |
|---|---|
| Highway MPG | 34 |
| Combined MPG | 29 |
| Save/Spend vs Average Car | Save $750 |
| Fuel Cost | $2,150 |
| Fuel Type 1 | Regular |
| Barrels of Petroleum | 10 |
| Grams of CO2 | 4,680,000 |
| Trees Needed to Offset | 223 |
| Drive | Front-Wheel Drive |
| Cylinders | 4 |
| Displacement | 2.5 |
| Transmission | Manual 6-spd |
| Vehicle Class | Compact 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.
<a href="https://mpgbuddy.com/cars/mazda/3-4-door/2018">2018 Mazda 3 4-Door MPG and Fuel Economy</a>
"2018 Mazda 3 4-Door MPG and Fuel Economy." MPG Buddy. Accessed on January 3, 2026. https://mpgbuddy.com/cars/mazda/3-4-door/2018.
"2018 Mazda 3 4-Door MPG and Fuel Economy." MPG Buddy, https://mpgbuddy.com/cars/mazda/3-4-door/2018. Accessed January 3, 2026.
2018 Mazda 3 4-Door MPG and Fuel Economy. MPG Buddy. Retrieved from https://mpgbuddy.com/cars/mazda/3-4-door/2018.