2018 BMW 640i xDrive Gran Turismo MPG & Specs — Real Fuel Cost
Quick answer
The 2018 BMW 640i xDrive Gran Turismo gets an EPA-estimated 20/28 MPG (city/highway) and 23 MPG combined, with an estimated $3,300/year fuel cost and 388 g/mi CO₂. Engine: 3 L 6-cyl.
The 2018 BMW 640i xDrive Gran Turismo with the 3-liter 6-cylinder premium gasoline engine returns an EPA-estimated 20 MPG in the city and 28 MPG on the highway, for a combined 23 MPG. This page summarizes the official EPA fuel-economy and emissions data for this configuration.
| Engine | 3 L 6-cyl |
| Transmission | Automatic (S8) |
| Drive | All-Wheel Drive |
| Fuel type | Premium Gasoline |
| Vehicle class | Large Cars |
| MPG — city | 20 |
| MPG — highway | 28 |
| MPG — combined | 23 |
| Annual fuel cost* | $3,300 |
| CO₂ tailpipe | 388 g/mi |
| EPA GHG score | 5/10 |
How efficient is it?
With a combined 23 MPG, the 2018 BMW 640i xDrive Gran Turismo sits in the moderate range for fuel economy. That is roughly 12% thirstier than the typical Large Cars of its era (26 MPG class average) — expect higher fuel bills than class-average alternatives.
Fuel economy and running costs
At about $3,300 per year in fuel (EPA estimate, 15,000 mi/yr), fuel is a major part of the cost of owning the 2018 BMW 640i xDrive Gran Turismo. Over five years that is roughly $16,500 at today's prices — before insurance, maintenance, and depreciation.
Emissions
The 2018 BMW 640i xDrive Gran Turismo emits approximately 388 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.