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We just purchased a 2008 F-250 Lartiat with the 6.4l diesel. We had a 05 Expedition. The question we have is what are others getting for fuel mileage? On our Expo we were getting 15 to 17 city and 20 to 22 hwy. The F-250 is getting between 11 and 12.5 mpg. It is all stock. We thought it might get better mileage than we are but are still very pleased with the truck. We perfer not to make any modifications to the truck.
Sorry to say, but the 6.4L power Stroke is not at all known for getting good fuel economy stock. 11 to 12.5 sounds pretty normal.
You may want to head down to the engine specific forum (6.4L Power Stroke) where there are some smart owners who can tell you what you can do to increase your fuel mileage. Just follow this link. 6.4L Power Stroke Diesel - Ford Truck Enthusiasts Forums
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.