Ford Ecoboost to 6.2L Economy

Samsonsworld wrote:

Hybridhunter wrote:
recommends premium for heavy use, the 6.2 in the F250 and F350 does not

Actually, my manuals read the same for both. For optimum performance, use premium.

The difference in performance between engines is quite noticeable.

Hmm, I did not notice that but sure enough there it is in the Super Duty owners manual just like it says for the Ecoboost in the F150 owners manual.

2017 Ford Superduty Owners manual - Page 185

"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."

The F150 owner's manual says the same exact thing because the engine will advance timing and increase power output if premium fuel is detected. I would imagine the 6.2L does the same. It is not that it is needed just like the Ecoboost, but if you want the engine to increase power for the best overall performance then you can add premium. I believe the Gen 1 3.5L Ecoboost increased its performance to 385 hp and 430 lb-ft when running on premium fuel from what I remember from a PUTC article.

Some here actually believe the Ecoboost requires it when towing heavy, but they are misinterpreting what Ford is saying here. I guess they haven't gotten up to snuff on the latest technology like wide band knock sensors and cam phasers that can adjust timing and engine power output on the fly unlike the old days when engines had fixed timing.

Engines that run on E85 do the same thing. They will alter timing and increase power output when running E85, but this does not mean you need to run it. It just means you will gain more power and performance from engine when running it.