458 speciale fuel requirements

The car is designed to run on 95 Euro-octane, which should be 91 US...
However, if you ask 458trofeo it has to be 100 ;-)

 

Euro 95? Are you sure it's not euro 98 ( super plus)??? My E92 M2 runs on Euro 98, mandatory by BMW, so a super car like the Speciale runs on 95? I don't think so....

 

Ferrari recommends RON 98 octane for the Speciale, but 95 is also acceptable.

Octane numbers are determined using different methods RON, MON and AKI...which is (RON+MON)/2. AKI is what we usually see on pumps in the US.

In a nutshell, an AKI octane rating of 91 will be fine for the Speciale because it's probably closer to a RON 95 octane rating which is acceptable for the Speciale. Of course an AKI octane rating of 93 would be even better (naturally) because it's closer to a RON octane rating of 98

Anti-Knock Index (AKI) often written on pumps as (R+M)/2)
In most countries, including Australia, New Zealand and all of those in Europe, the "headline" octane rating shown on the pump is the RON, but in Canada, the United States, Brazil, and some other countries, the headline number is the average of the RON and the MON, called the Anti-Knock Index (AKI, and often written on pumps as (R+M)/2). It may also sometimes be called the Pump Octane Number (PON).

NOTE: European rating (RON) is about 4-5 octane points higher than comparable fuel in the US.