Don't use premium gas if your car isn't rated for it.

Pour mon vieux bazoux 96 c'est que du Super chez Shell,
le char est tuné pour du 93 mais le super chez Shell fait la job.
 
Do any of the octane boosters like STP, Lucas or Gumout etc actually work? Probably not. Real octane booster is toluene like the F1 teams used in the late 80's and early 90's, cost was over 200GBP/liter but I suspect CT isn't going to be selling that.
 
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