ShinerBock wrote:
Bionic Man wrote:
As opposed to the EcoBoost, which also recommends 91 octane?
For best overall vehicle and engine performance, premium fuel with an octane rating of 91 or higher is recommended. The performance gained by using premium fuel is most noticeable in hot weather as well as other conditions, for example when towing a trailer. See Towing a Trailer.
F150 Owners Manual
Nope, you don't need to. I asked Ford engineer about this when I had my Ecoboost(perks of working for a company that owns a few Ford dealerships). He said the 3.5 EB will run fine on 87 without knocking even when towing. The advertised SAE power numbers are all on 87 octane. However, as the manual states, if I wanted better performance out of the truck when towing then he recommended I use 91 octane because the higher octane will allow the truck to advance timing without knocking and increase power output.
This was confirmed by Pickuptrucks.com when they posted that Ford stated the Gen 1 3.5L EB's power output increased to 385 hp and 430 lb-ft with 91 octane.
Pickuptrucks.com wrote:
We should note Ford tells us that its power outputs improve slightly, measuring 385 horsepower and 430 pounds-feet of torque when using premium fuel, instead of the regular fuel the owner's manual recommends.
Ford vs. GM: Twin-Turbo Showdown
Nice. So, you are going with the "I had a guy tell me" theory. Reminds me of someone else on this forum......
Did the "Ford engineer" you spoke with put that in writing like the link to the owners manual?
Plenty of people talk about using the 6.2 with standard octane as well. Compare apples to apples. Which is what the manufacture recommends in print. Which is in the owners manual. Which is premium fuel for both the EcoBoost and 6.2.
