I loaned my '89 to my room-mate a couple of times, and in return, they filled the tank with 91 or 94 octane, thinking they were doing me a favor with the expensive stuff.
I noticed no increase in performance or fuel milage. Your "immediate difference" in performance statement just doesn't reflect the experience I have had.
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'89 LX 5.0 - 5 speed. Original Owner
'94 E-150 4.9 Hi-Top Conversion Van
'06 Mustang V-6, 5 speed
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