Most gas stations in Europe put the RON (research octane number) on the pumps.

In America it's RON+MON / 2
= AON (average octane number)

(MON=motor octane number)

So MON is 88 most of the time, so if you take Aral's 102 RON + 88 MON and divide it with 2 you get 95 AON.

So we basicly get ripped off in Europe lol.

People who don't have a clue think every gas station in America sells worse gasoline than in Europe because they get fooled by the numbers....basicly the same with audio amplifiers and speakers (peak and rms)

The gasoline in America is or was slightly different to the gasoline in Europe , because of that the engine in my car in the US was made out of cast iron while in Europe it was made from aluminum, but I don't think it has anything to do with the octane numbers.

Racing fuel has 120 RON max....Formula 1 fuel is 102 RON...the same number you get at Aral stations.

The German wiki article explains alot more and has different value tables but the English version is doing the job as well

en.wikipedia.org/wiki/Octane_rating