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What is the gas mileage on a 6.7 L F-350?

The Ford F-350 with a 6.7-liter diesel engine has an average fuel economy of 19 miles per gallon (mpg) in combined city and highway driving. This efficient performance makes the F-350 a capable and practical choice for those who need a powerful heavy-duty truck.

Factors Affecting the F-350's Fuel Efficiency

The gas mileage of the 6.7L Ford F-350 can vary depending on several factors, including driving conditions, load, and driving style. Here's a closer look at what influences the truck's fuel economy:

Engine Size and Power: The 6.7-liter Power Stroke V8 diesel engine in the F-350 produces 475 horsepower and 1,050 lb-ft of torque, providing ample power for towing and hauling heavy loads. However, this powerful engine also requires more fuel to operate compared to smaller engines.

Driving Conditions: Fuel efficiency is typically higher on the highway, where the engine can operate at a more consistent speed, compared to stop-and-go city driving. Towing heavy loads or driving in hilly terrain can also reduce the F-350's fuel economy.

Driving Style: Aggressive acceleration, high speeds, and frequent braking can all negatively impact the F-350's fuel efficiency. Maintaining a moderate, steady pace and avoiding unnecessary idling can help maximize the truck's gas mileage.

Payload and Towing Capacity: The F-350's fuel economy will be lower when the truck is carrying heavy payloads or towing large trailers, as the engine has to work harder to move the additional weight.

By understanding these factors and adjusting driving habits accordingly, F-350 owners can optimize the truck's fuel efficiency and get the most out of their diesel engine.

Comparing the F-350's Fuel Economy to Other Heavy-Duty Trucks

When compared to other heavy-duty trucks in its class, the Ford F-350's fuel economy is on par with or better than the competition. For example, the Chevrolet Silverado 3500HD with a 6.6-liter diesel engine has an EPA-estimated fuel economy of 18 mpg combined, while the Ram 3500 with a 6.7-liter diesel engine achieves 18 mpg combined as well.

The F-350's 19 mpg combined rating makes it a fuel-efficient choice in the heavy-duty truck segment, especially when considering the truck's impressive towing and hauling capabilities. Drivers who prioritize both power and efficiency will find the F-350 to be a well-balanced and practical option.

What is the gas mileage on a 6.7 Power Stroke vs 6.7 Cummins?

The Ford 6.7L Powerstroke generally gets better highway mileage, typically between 19–20 MPG when unloaded, while the 6.7L Cummins averages around 16–18 MPG. However, the Cummins often performs better under heavy towing loads due to its high low-end torque. Real-world fuel economy can vary significantly depending on factors like model year, vehicle condition, payload, and driving habits.
This video compares the performance of a 6.7L Powerstroke and a 6.7L Cummins in a pulling competition: 57sMann Family FarmsYouTube · Jul 3, 2021
6.7L Cummins

Highway MPG (unloaded): 16–18 MPG
City MPG: Around 12 MPG
Towing: Stronger under heavy towing loads due to high low-end torque.

This video shows a MPG challenge comparing a 6.7L Duramax, 6.7L Cummins, and a 6.7L Powerstroke: 56sThe Fast Lane TruckYouTube · Jun 19, 2018
6.7L Powerstroke

Highway MPG (unloaded): Up to 20 MPG
City MPG: Around 14–15 MPG
Towing: Often slightly less fuel-efficient when towing heavy loads compared to the Cummins.

Key considerations

Load: The 6.7L Powerstroke tends to have an advantage in fuel economy when unloaded, but this gap narrows significantly or reverses when towing heavy loads, where the Cummins' torque becomes a benefit.
Model Year: Fuel economy can vary between different model years for both engines due to design updates.
Driving Conditions: Urban vs. highway driving, speed, and driving habits will all affect the final MPG.
Towing/Payload: When a truck is fully loaded, fuel economy drops for both engines. Some drivers report a full load can bring the MPG down to around 11.2 MPG for either engine, though this is highly variable.

How to get better fuel mileage in a Ford 6.7 diesel?

You can improve 6.7 Powerstroke fuel mileage by changing your driving habits, performing regular maintenance, and making certain modifications. Aggressive driving and excessive idling reduce fuel economy, while driving smoothly, using cruise control, and maintaining proper tire pressure can help. Regular maintenance, such as changing air filters and oil, is crucial, and some drivers see significant gains from engine tuning, a cold air intake, or a DPF delete (though the latter may have legal implications).
This video demonstrates how to improve your fuel economy by changing your driving habits: 49sPower Stroke MaintenanceYouTube · Apr 25, 2023
Driving habits

Drive smoothly: Avoid aggressive acceleration and hard braking.
Reduce high speeds: Driving at lower highway speeds, like 65 mph instead of 75 mph, can significantly improve mileage.
Avoid excessive idling: Let the engine warm up briefly and then drive, rather than idling for extended periods.
Use cruise control: Maintain a steady speed on the highway to avoid fluctuations.

Maintenance and upkeep

Change filters: Regularly replace the air filter and other maintenance items.
Keep up with oil changes: Ensure your engine oil is changed regularly.
Check tire pressure: Maintain correct tire pressure, as underinflated tires can decrease fuel efficiency.

Modifications and tuning

Engine tuning: Aftermarket tunes can optimize the engine's air-fuel ratio and injection timing for better efficiency.
Cold air intake: Upgrading to a cold air intake can improve air density, potentially leading to better fuel economy.
DPF delete: Some drivers report significant mileage improvements after removing the Diesel Particulate Filter, but this is often illegal and can have environmental consequences.

This video shows how a DPF delete can affect your truck's performance and fuel economy: 59sTyler LanzYouTube · Oct 19, 2021

Which is better, 7.3 gas or 6.7 Power Stroke?

The main differences are that the 6.7L diesel engine offers significantly more torque and better fuel efficiency (especially when towing), while the 7.3L gas engine is cheaper to purchase, lighter, and has more horsepower at higher RPMs. The best choice depends on your needs: choose the 6.7L diesel for heavy-duty towing and commercial use, and the 7.3L gas for lighter towing and general use where lower upfront costs are prioritized.

This video explains the performance difference between 6.7L diesel and 7.3L gas engines in Ford Super Duty trucks: 47sJB ReviewsYouTube · Nov 19, 2023
6.7L Powerstroke Diesel

Performance: Has substantially more torque, making it ideal for heavy-duty towing and hauling.
Fuel Efficiency: Gets better average fuel economy compared to the gas engine, though fuel costs can be higher.
Cost: Has a higher initial purchase price.
Maintenance: Can have higher maintenance costs and requires exhaust fluid (DEF).
Driving Experience: Less prone to "hunting" for gears when towing up hills.
Ideal For: Towing very heavy loads (14,000 lbs or more) or frequent commercial use.

You can watch this video to see how the 6.7L diesel engine performs when towing heavy loads: 45sJB ReviewsYouTube · Nov 12, 2023
7.3L Godzilla Gas

Performance: Has more horsepower at higher RPMs, but significantly less torque than the diesel.
Fuel Efficiency: Lower fuel efficiency compared to the diesel, especially when towing.
Cost: Cheaper to purchase upfront.
Maintenance: Generally has lower maintenance costs and no need for DEF.
Driving Experience: Can feel underpowered when towing heavy loads and may require more gear-shifting.
Ideal For: Lighter towing (around 10,000 lbs) or general use where lower purchase cost is a priority.

This video compares the 7.3L gas engine with the 6.7L diesel engine for truck owners: 58sT & T Landscape & MasonryYouTube · Dec 10, 2022

What MPG does a 6.7 Power Stroke get?

The 6.7L Powerstroke's real-world fuel economy varies, but typically falls in the range of 12-18 MPG combined, with highway driving often yielding 17-20 MPG and mixed city/highway being closer to 15-18 MPG. Factors like driving habits, towing, and terrain significantly affect mileage, with some users reporting even higher numbers (up to 22+ MPG) under ideal conditions.
Typical MPG by driving condition

Mixed driving: Expect around 15-18 MPG for a mix of city and highway driving.
Highway driving: On the highway, you can typically see 17-20 MPG, and potentially higher on flat roads at a steady speed.
Towing: Mileage decreases significantly when towing, with some drivers reporting 4-6 MPG when towing heavy loads uphill.

Factors that influence fuel economy

Driving style: Aggressive driving and excessive idling will lower your MPG.
Terrain: Driving in hilly or mountainous areas will reduce fuel efficiency compared to driving on flat ground.
Speed: Higher highway speeds lead to lower fuel economy. Some drivers report getting over 20 MPG by driving at lower speeds (around 50-55 mph).
Tires: Larger, aftermarket tires can negatively impact your MPG.
Towing weight: The weight of your trailer has a major impact on fuel consumption. More weight equals lower MPG.

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.