How many miles per gallon does a 2008 6.4 Powerstroke get?
On average, a 2008 Ford F-Series Super Duty with the 6.4L Power Stroke diesel delivers roughly 14-16 mpg in mixed driving, with highway figures typically higher and city figures lower. Real-world results depend on drivetrain, load, towing, and upkeep.
Overview of MPG expectations
The 6.4L Power Stroke arrived with emissions equipment that can influence real-world mileage, especially under stop-and-go driving or heavy towing. While highway cruising often yields the best numbers, towing and payload can significantly reduce mpg. Below are representative EPA estimates and common owner observations to set expectations for this engine in 2008 models.
EPA estimates by drivetrain
Official numbers vary slightly by configuration, but these figures provide a baseline for typical 2008 6.4L Power Stroke trucks.
- Two-wheel drive (2WD) with automatic transmission: City about 13 mpg, Highway about 18 mpg, Combined around 15 mpg
- Four-wheel drive (4WD) with automatic transmission: City about 12 mpg, Highway about 17 mpg, Combined around 14–15 mpg
These EPA estimates give a baseline for what a non-towing, well-maintained truck can achieve under standard testing conditions. Real-world results can vary based on speed, terrain, and maintenance history.
Real-world driving observations
Owners and testers often report a range that reflects typical day-to-day use, including towing and heavy payloads.
- Combined driving (not towing): roughly 12–15 mpg is common for many 2008 6.4L Power Stroke trucks
- Highway driving without heavy load or towing: often in the 17–22 mpg band, depending on speed and conditions
- With towing or heavy payload: substantial drops, sometimes down to the 8–12 mpg range depending on load and terrain
These real-world figures illustrate the variability of fuel economy in practice, especially for a heavy-duty diesel designed for hauling and work rather than efficiency alone.
What affects mpg on a 2008 6.4 Power Stroke?
Fuel economy is influenced by several factors beyond configuration. Maintenance, driving behavior, and operating conditions play large roles in the mileage you see in daily use.
Key factors to watch
- Engine health and maintenance (air filter, fuel system, and injectors)
- Proper cooling and EGR/DPF maintenance to prevent excessive regen cycles
- Payload and towing weight, as well as hitch setup and trailer aerodynamics
- Driving habits (speed, acceleration, and speed consistency)
- Tyre type and pressure, which affect rolling resistance
- Terrain and altitude, which influence engine load and efficiency
Keeping these factors in check can help maximize gas mileage and maintain expected performance over the vehicle’s life.
Summary
The 2008 6.4 Power Stroke typically achieves around 14–16 mpg combined in mixed use, with highway figures commonly in the high-teens to low-20s and city mileage in the low-to-mid teens. Real-world results vary widely due to towing, payload, maintenance, and driving style. For owners, maintaining the emission-control systems and practicing efficient driving can help sustain better fuel economy over time.
Bottom line
If you’re shopping or evaluating a 2008 6.4 Power Stroke, plan for mid-teens efficiency in routine use, stronger highway performance, and the likelihood of lower numbers when towing. Use the EPA estimates as a baseline, but expect a wide range based on how the truck is set up and used.
