87(with out ethanol) provide more HP and fuel mileage than 89 and 91, when tested at a local race shop 87 vs 91 dino proven 87 gave 15 extra hp in a 04 mustang, 13 in a 01 S2k...... also stay away from E10, E85, etc. ethanol robs fuel mileage and HP.
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Chuck Norris for President!!
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