2015 Infiniti Q40 MPG & Specs — Real Fuel Cost
Quick answer
The 2015 Infiniti Q40 gets an EPA-estimated 19/27 MPG (city/highway) and 22 MPG combined, with an estimated $3,450/year fuel cost and 412 g/mi CO₂. Engine: 3.7 L 6-cyl.
The 2015 Infiniti Q40 with the 3.7-liter 6-cylinder premium gasoline engine returns an EPA-estimated 19 MPG in the city and 27 MPG on the highway, for a combined 22 MPG. This page summarizes the official EPA fuel-economy and emissions data for this configuration.
| Engine | 3.7 L 6-cyl |
| Transmission | Automatic (S7) |
| Drive | Rear-Wheel Drive |
| Fuel type | Premium Gasoline |
| Vehicle class | Midsize Cars |
| MPG — city | 19 |
| MPG — highway | 27 |
| MPG — combined | 22 |
| Annual fuel cost* | $3,450 |
| CO₂ tailpipe | 412 g/mi |
| EPA GHG score | 5/10 |
How efficient is it?
With a combined 22 MPG, the 2015 Infiniti Q40 sits in the moderate range for fuel economy. That is roughly 14% thirstier than the typical Midsize Cars of its era (26 MPG class average) — expect higher fuel bills than class-average alternatives.
Fuel economy and running costs
At about $3,450 per year in fuel (EPA estimate, 15,000 mi/yr), fuel is a major part of the cost of owning the 2015 Infiniti Q40. Over five years that is roughly $17,250 at today's prices — before insurance, maintenance, and depreciation.
Emissions
The 2015 Infiniti Q40 emits approximately 412 grams of CO₂ per mile at the tailpipe, earning an EPA greenhouse-gas score of 5 out of 10. Lower emissions generally track higher fuel economy.
How to read these numbers
EPA figures come from standardized laboratory test cycles and are the same estimates shown on the vehicle's window sticker. Your real-world mileage depends on driving style, conditions, fuel grade, and maintenance. Use combined MPG and annual fuel cost to compare vehicles fairly.