Since your vehicle
requires Octane Rating 87 (which is probably (RON+MON) / 2) or RON 91, and your fuel choices are RON 90 and RON 95, then technically it is most likely that only RON 95 will meet the requirement.
Not exact matches
Higher
octane ratings correlate to higher activation energies: the amount of applied energy
required to initiate combustion.
By «
requiring» high
octane fuel, they can use use it for EPA testing and are therefore able to eeek out high mpg
ratings.
The car runs on 100
octane fuel to avoid knocking and premature combustion issues as the high
octane fuel
requires higher heat / compression
rate for the combustion and best used with the powerful turbocharged engines.
E85 biofuel has a very high
octane rating of 105 but a lower energy content that
requires a 30 per cent increase in the engine fuel flow
rate.