MPG & Fuel Economy Data
The 2018 BMW 340i has an estimated 25.0 MPG combined. This premium gasoline-powered vehicle offers 21.0 MPG in the city and 32.0 MPG on the highway. Check out its full EPA-estimated fuel economy data below.
Combined25.0 MPG
City21.0 MPG
Highway32.0 MPG
CO₂ Emissions352 g/mi
GHG Score5/10
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With a Greenhouse Gas Score of 5/10, the 2018 BMW 340i shows average environmental performance in its class. This score suggests typical greenhouse gas emissions for vehicles in this category.
The vehicle produces approximately 352 grams of CO₂ per mile under typical driving conditions. Consider more fuel-efficient alternatives if environmental impact is a priority.
This compact cars features a 3.0L 6-cylinder engine, paired with a automatic (s8) transmission and rear-wheel drive drivetrain. It includes start-stop technology to improve fuel efficiency in city driving conditions. Plus it has a turbocharged engine for improved power and efficiency.
To achieve the best fuel economy in your 2018 BMW 340i, consider these tips:
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This Fuel Savings Calculator tool is provided for informational and educational purposes only. The MPG data used is sourced from the U.S. Environmental Protection Agency (EPA), an official government resource, and while efforts are made to ensure accuracy, discrepancies or updates may occur. Calculations are based on standard assumptions and estimates, which may not reflect individual circumstances or real-world conditions. Users are responsible for verifying results with their own data and should consult additional resources or/and professionals for critical decisions. This tool is provided "as is" without warranties of any kind, and the developers disclaim any liability for decisions or actions taken based on its output. The tool may be updated or modified without notice, affecting its functionality or results. By using this tool, you acknowledge and agree to these terms.
The 2018 BMW 340i with manual 6-spd has an estimated 23.0 MPG combined. This manual 6-spd premium gasoline-powered vehicle offers 19.0 MPG in the city and 29.0 MPG on the highway.
Combined23.0 MPG
City19.0 MPG
Highway29.0 MPG
CO₂ Emissions389 g/mi
GHG Score5/10
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When using premium gasoline, the 2018 BMW 340i with manual 6-spd has a carbon footprint of 389 grams of CO₂ per mile. Its Greenhouse Gas Score of 5/10 indicates its relative environmental impact, with higher scores representing lower emissions.
These environmental metrics reflect the vehicle's efficiency in manual 6-spd configuration. The CO₂ emissions measurement provides a direct indicator of the vehicle's contribution to greenhouse gases, while the GHG score offers a standardized comparison with other vehicles in its class.
This variant includes start-stop technology, which can help reduce emissions and fuel consumption during city driving by automatically shutting off the engine when the vehicle is stationary.
This compact cars with manual 6-spd features a 3.0L 6-cylinder engine and rear-wheel drive drivetrain. It includes start-stop technology to improve fuel efficiency in city driving conditions. And it has a turbocharged engine for improved power and efficiency.
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25.0 MPG
View detailed fuel economy data
25.0 MPG
View detailed fuel economy data
25.0 MPG
View detailed fuel economy data
These vehicles are in the same class (Compact Cars) and offer comparable fuel economy ratings.