Exactly.
High octane gas will 'resist' combustion more than a lower octane level - all things equal.
I find it amusing when you see kids pickup a can of SUPEROUTLAW OCTANE BOOSTER 104+ OCTANE!!!! for their Honda Civic that has been 'modified' with wires and a fart can.
The car was made to run on 87, so the super octane boost crap is most likely slowing them down. And actaully, with diliution on a full tank of gas, it would take several bottles of octane boost to really move the octane levels up that much anyways.
Bottom line is that in most cases this stuff is worthless. You're better off getting 89, 92, 93 or 94 octane from your local gas station - choosing the grade that your car really needs.
E
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1991 5.0 LX Coupe - 40,750 miles
331 cu. in. / Tremec 3550 / BFG Drag Radials
12.22 @ 114.31 mph - w/1.89 60'
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