i cannot get marvel oil here but i have bought a couple of bottles of fuel injector cleaner and gas treatment.i looked into buying octane booster and thought i would but when i read the back of the bottle i got the impression it wouldn't raise my octane level.when i put gas in it's always premium which has an octane number of at least 92.would octane booster still hellp this?

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'95 s500 (bought for wife but can't bear to share!!!) 125kms
'92 legend 180kms
'88 tbirdturbo(fantastic car-only regular maint.)120kms
'87 mustang gt(gone)
'86 tbirdturbo(gone)
'85 mustang gt(gone-but not forgotten)