How many gallons does a 6.7 diesel hold?
A 6.7-liter diesel engine typically has a fuel tank capacity of around 26-34 gallons, depending on the specific vehicle model. The exact fuel tank size can vary, but this range provides a general estimate for a 6.7 diesel engine.
Detailed Explanation
The fuel tank capacity for a vehicle with a 6.7-liter diesel engine can vary depending on the make, model, and year of the vehicle. Diesel engines are commonly found in larger trucks and SUVs, which tend to have larger fuel tanks to accommodate their increased fuel consumption compared to gasoline-powered vehicles.
Based on the information gathered from various sources, a 6.7 diesel engine is most commonly found in the following vehicles:
- Ford Super Duty trucks (F-250, F-350, F-450, etc.)
- Dodge/Ram Heavy Duty trucks (2500, 3500, etc.)
- Chevrolet/GMC Heavy Duty trucks (2500, 3500, etc.)
The fuel tank capacities for these vehicles with a 6.7-liter diesel engine typically range from 26 to 34 gallons. For example:
- Ford Super Duty trucks: 26-34 gallons
- Dodge/Ram Heavy Duty trucks: 30-34 gallons
- Chevrolet/GMC Heavy Duty trucks: 28-36 gallons
It's important to note that the exact fuel tank capacity can vary based on the specific model, year, and configuration of the vehicle. Factors such as the presence of an optional larger fuel tank or the vehicle's intended use (e.g., commercial vs. personal) can also affect the fuel tank size.
How many miles per gallon does a 6.7 F 250 diesel get?
A Ford F-250 with the 6.7L diesel engine typically gets 18-20 mpg on the highway and 15-18 mpg in mixed city/highway driving when unloaded. Fuel economy drops significantly when towing, with estimates ranging from 8.9 to 12-15 mpg depending on the load. Real-world mileage is affected by driving style, speed, terrain, and other factors.
Unloaded driving
- Highway: Expect around 18-20 mpg on the highway under optimal conditions. Some drivers report getting as high as 24 mpg on highways, particularly with the high-output (HO) engine and gentle driving.
- Mixed/City: You can expect a combined average of 15-18 mpg.
- Factors: Driving speed has a significant impact. Driving at 80 mph can reduce fuel economy compared to driving at 60-65 mph, where you might see higher mileage.
This video shows a real-world fuel economy test of a Ford F-250 diesel truck: 40sSkinner’s DOSEYouTube · Nov 10, 2025
Towing
- Towing MPG: When towing, fuel economy can drop to 12-15 mpg.
- Heavier loads: With very heavy loads (e.g., a 17,000 lb 5th wheel), mileage can drop to under 9 mpg.
This video demonstrates a fuel economy test of a Ford F-250 diesel while towing a trailer: 59sTFLnowYouTube · Apr 9, 2025
Other considerations
- High-output (HO) engine: The high-output version of the 6.7L engine offers more power with little to no difference in fuel consumption compared to the standard engine under normal conditions.
- Engine break-in: New engines may have lower fuel economy until they are broken in.
- DPF delete: Aftermarket modifications like a DPF delete may increase MPG, but this is not recommended for street use.
How many gallons does a 6.7 diesel take?
Capacities and Specifications - 6.7L Diesel
| Item | Capacity |
|---|---|
| Fuel tank (Dual)(Right side) | 47 gal (177.9 L) (Usable capacity)3 |
| 50 gal (189.2 L) (Liquid capacity) | |
| Fuel tank (Small) | 47 gal (177.9 L) (Usable capacity)3 |
| 50 gal (189.2 L) (Liquid capacity) |
How many gallons of diesel does a F250 Super Duty hold?
34-gallon
The 2025 Ford F-250 comes equipped with a standard 34-gallon fuel tank, providing a solid balance between capacity and weight. For customers requiring extended range for long hauls or remote work sites around Deep Gap or Vilas, Ford offers an optional 48-gallon tank on select configurations.
Which is better, 6.7 Cummins or 6.7 Power Stroke?
Neither the 6.7L Cummins nor the 6.7L Powerstroke is definitively "better," as the best choice depends on your priorities. The Cummins is generally favored for heavy-duty towing and long-term durability, while the Powerstroke often excels in everyday performance, with better fuel efficiency and responsiveness.
This video compares the 6.7 Powerstroke and 6.7 Cummins engines: 43sGetty's GarageYouTube · Jul 9, 2023
6.7L Cummins
- Best for: Heavy-duty towing and longevity.
- Strengths:
- Known for high torque at lower RPMs, which is ideal for towing.
- Has a strong reputation for long-term durability.
- Weaknesses:
- Can be more sluggish from the factory compared to the Powerstroke.
- Some model years may have specific issues, such as exhaust manifold problems in trucks that frequently tow or potential lifter failures.
6.7L Powerstroke
- Best for: Everyday driving, high-speed performance, and responsiveness.
- Strengths:
- Often has better fuel economy in highway and daily driving.
- Provides quicker acceleration and more horsepower out of the box.
- Generally considered smoother, with less vibration.
- Weaknesses:
- Tuning can lead to reliability concerns with the turbocharger's ball bearings over time.
- While robust, some mechanics note that pushing the engine to extreme power levels can lead to transmission issues.
Which one should you choose?
- If your priority is hauling heavy loads up steep inclines and you need maximum low-end grunt: The 6.7L Cummins is likely the better option.
- If your priority is a balance of performance and efficiency for daily driving and you value quicker acceleration: The 6.7L Powerstroke is the better choice.
- If you plan on heavy towing, consider the transmission behind the engine. The Cummins engine in some Ram models is paired with a 6-speed transmission that can be a limiting factor for towing performance.
- If you are looking at a used truck: Research the specific model years for known issues and reliability reports for both engines. Some model years of the Cummins may have a less robust transmission compared to what a Powerstroke is paired with in a Ford truck.
