The fuel economy or gas mileage of 2023 BMW 8 Series variants, as measured by EPA, is given below in terms of miles per gallon (mpg):
| 2023 BMW 8 Series Variants | City MPG | Highway MPG | Combined MPG |
|---|---|---|---|
| 2023 BMW 840i Gran Coupe 6 cylinder, 3.0 L, Automatic (S8) | 21 | 29 | 24 |
| 2023 BMW 840i xDrive Gran Coupe 6 cylinder, 3.0 L, Automatic (S8) | 21 | 29 | 24 |
| 2023 BMW Alpina B8 Gran Coupe 8 cylinder, 4.4 L, Automatic (S8) | 17 | 24 | 19 |
| 2023 BMW M850i xDrive Gran Coupe 8 cylinder, 4.4 L, Automatic (S8) | 17 | 24 | 19 |
| 2023 BMW 840i Convertible 6 cylinder, 3.0 L, Automatic (S8) | 21 | 29 | 24 |
| 2023 BMW 840i Coupe 6 cylinder, 3.0 L, Automatic (S8) | 21 | 29 | 24 |
| 2023 BMW 840i xDrive Convertible 6 cylinder, 3.0 L, Automatic (S8) | 21 | 29 | 24 |
| 2023 BMW 840i xDrive Coupe 6 cylinder, 3.0 L, Automatic (S8) | 21 | 29 | 24 |
| 2023 BMW M850i xDrive Convertible 8 cylinder, 4.4 L, Automatic (S8) | 17 | 24 | 19 |
| 2023 BMW M850i xDrive Coupe 8 cylinder, 4.4 L, Automatic (S8) | 17 | 24 | 19 |
This model ranges from 17 mpg to 29 mpg in standard test conditions, as per EPA. However, this mileage will vary based on various factors including your driving style, road conditions and vehicle condition. 2023 BMW 8 Series comes with fuel tank capacity of 18 gallons. Some of the variants like M8 from BMW 8 Series also do come with 20.1 gallons fuel tank capacity. With this fuel tank capacity, most efficient variant can run up to 522 miles in highway condition when tank is full.