99WhiteC5Coupe
Full Access Members
The manual does state that you can use regular or premium, although Ford recommends premium (as it does in all EcoBoosts). It also warns that you may hear some light knocking when using regular. I am happy to use what is recommended, plus I want those extra ponies!!
I have a 2015 Expedition Limited 4x4 with the 3.5 Ecoboost engine. The manual states 87 fuel can be used and recommends premium fuel for towing.
How did you determine that “Ford recommends premium (as it does in all EcoBoosts)”? What is your source of information for this statement?