2018 Infiniti Q50 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 Infiniti Q50.

The 2018 Infiniti Q50 has 2 model options: Automatic (S7) 6-cyl, 3.0 L and Automatic (S7) 4-cyl, 2.0 L.

The 2018 Infiniti Q50 Automatic (S7) 6-cyl, 3.0 L runs on premium gasoline and is in the Midsize Cars car class.

The 2018 Infiniti Q50 Automatic (S7) 4-cyl, 2.0 L runs on premium gasoline and is in the Midsize Cars car class.

🛣 How Many Miles per Gallon (MPG) Does a 2018 Infiniti Q50 Get?

Across all models, the combined average MPG for the 2018 Infiniti Q50 is 24 miles per gallon.

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

Model OptionCombined MPGCity MPGHighway MPG
Automatic (S7) 6-cyl, 3.0 L232029
Automatic (S7) 4-cyl, 2.0 L252330

💵 What is the Average Yearly Fuel Cost for a 2018 Infiniti Q50?

The average fuel costs for all models of the 2018 Infiniti Q50 is $3,075.

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 Infiniti Q50 to an average vehicle over 5 years, you will spend $3,875 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 (S7) 6-cyl, 3.0 L$3,200spend $4,500 more
Automatic (S7) 4-cyl, 2.0 L$2,950spend $3,250 more

🛢 How Many Barrels of Petroleum Does a 2018 Infiniti Q50 Consume?

Across all models, the average number barrels of petroleum that the 2018 Infiniti Q50 will consume in one year is 13 barrels.

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

Model OptionBarrels
Automatic (S7) 6-cyl, 3.0 L13
Automatic (S7) 4-cyl, 2.0 L12

💨 How Many Grams of CO2 Does a 2018 Infiniti Q50 Emit?

The 2018 Infiniti Q50 will emit an average of about 5,520,000 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 188 trees would be needed to offset emissions from the 2018 Infiniti Q50.

Overview

The tables below cover all of the miles per gallon, engine specifications, and emission details we have for the 2 2018 Infiniti Q50 model options.

Automatic (S7) 6-cyl, 3.0 L

The table below contains all of the details we have for the 2018 Infiniti Q50 Automatic (S7) 6-cyl, 3.0 L:

City MPG20
Highway MPG29
Combined MPG23
Save/Spend vs Average CarSpend $4,500
Fuel Cost$3,200
Fuel Type 1Premium
Barrels of Petroleum13
Grams of CO25,805,000
Trees Needed to Offset276
DriveRear-Wheel Drive
Cylinders6
Displacement3
TransmissionAutomatic (S7)
Vehicle ClassMidsize Cars
Start/Stop?No
Supercharged?No
Turbocharged?Yes

Automatic (S7) 4-cyl, 2.0 L

The table below contains all of the details we have for the 2018 Infiniti Q50 Automatic (S7) 4-cyl, 2.0 L:

City MPG23
Highway MPG30
Combined MPG25
Save/Spend vs Average CarSpend $3,250
Fuel Cost$2,950
Fuel Type 1Premium
Barrels of Petroleum12
Grams of CO25,235,000
Trees Needed to Offset249
DriveRear-Wheel Drive
Cylinders4
Displacement2
TransmissionAutomatic (S7)
Vehicle ClassMidsize Cars
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.

  • "2018 Infiniti Q50 MPG and Fuel Economy." MPG Buddy. Accessed on January 3, 2026. https://mpgbuddy.com/cars/infiniti/q50/2018.

  • "2018 Infiniti Q50 MPG and Fuel Economy." MPG Buddy, https://mpgbuddy.com/cars/infiniti/q50/2018. Accessed January 3, 2026.

  • 2018 Infiniti Q50 MPG and Fuel Economy. MPG Buddy. Retrieved from https://mpgbuddy.com/cars/infiniti/q50/2018.