Does EU Ecoboost have all the 314 HP with 95 RON gas?

As above. I read that in US, Ecoboosts only get 275 HP when using regular gasoline (87 AKI). The factory rated HP is only when using premium fuel (93 AKI).

AFAIK, 95 AKI is roughly equivalent to EU 98 RON, but our regular fuel is much better than US (~ 95 RON vs 91 RON).

Anyone with dyno outputs here in Europe showing any difference using 95 vs 98 RON gas?

Mine was done with 100 RON fuel: http://www.mustang6g.com/forums/showthread.php?t=36228

It came out as 297bhp. It depends on a lot of factors, temperature, air quality, humidity. Within 10% of what the manufacturer says it's OK.

Most people would not be able to tell 20hp difference anyway.

Yes, but I was curious about a dyno result with 95 RON.

I've seen both manuals, EU and USA, and while on the american one they state something like minimum 87 octanes, but use premium whenever possible for improved performance, on the european version they only state minimum 95, but say nothing about premium fuel.

Just wondering.

The US manual actually says for the EB & V8:

"To provide improved performance, we recommend premium fuel for severe duty usage, such as trailer tow."

So nothing specifically about "more HP with better fuel".... would you be using full performance for towing a trailer - this seems to me to be more about torque than outright power....

The UK manual doesn't mention higher octane fuel at all; it just says:

"Use minimum 95 octane unleaded gasoline that meets the specification defined by EN 228 or the equivalent national specification.
Your vehicle is suitable for use with ethanol blends up to 10% (E5 and E10)."

For what it's worth, US certification fuel used for government tests is 97RON.

So no updates on this subject? Everybody is using 95 octane gas on their euro ecoboost Mustangs?

There is actually a note on Ford US website saying both horsepower and torque values are measured on premium fuel. Never tested it though, I usually buy Shell V Power Nitro+ (100 octane).

I use Shell V Power (97 octanes). Car seems fine, although I never did a dyno. However, when competing with a friend of mine who has the same car, I did not see any difference in acceleration from stop.