Yes. I just got an update from one of my customers who has on 08 F550. He used to get 8-9 mpg around town and 6 mpg towing his horse trailer. We did the following mods: S&B Cold Air Intake, DPF delete into 5" exhaust, and PHP Gryphon programmer. He told me yesterday his around town mileage is now 16-17 mpg and he has been getting 14 mpg towing.
The 6.4's are really nice trucks when they are done right.
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