Tune /Octane question
 

I think the 2011+ GT ECM can automatically adjust from 89 octane to 93 plus . So how is anything to be really gained from a 93 octane tune? Am thinking of getting a tune and leaving ONLY this feature untouched, rather than getting a 93 octane tune and changing it when travelling to areas where high octane is not readily available or carrying an octane booster. Does the engine part of a tune really do anything besides retarding the spark? Really more interested in the transmission and accelerator modifications.

Sorry if this a stupid question.