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Using higher octane gas than suggested

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My 2006 Focus manual says the engine has a 10.1 to 1 compression ratio but recommends 87 octane. It does recommend against using 86 octane regular at higher altitudes.
 
who? said:
My 2006 Focus manual says the engine has a 10.1 to 1 compression ratio but recommends 87 octane. It does recommend against using 86 octane regular at higher altitudes.
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As engine design has gotten better (especially with computer simulations of combustion chamber temperature characteristics) higher compression for a given octane rating has become possible thanks to a reduction in hot spots that could trigger pre-ignition.

ZV
 
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