in all honesty dude, not to sound rude or anything like that at all here... but with you running 89 and MMO, your overall costs to get an extra 15 miles is not worth it IMHO...
I did the experiment too when I was younger with running the higher octane to improve mileage and while it did improve it slightly, the overall costs increased because of the higher price of the higher octane gas...
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Misty: 3400, S&S headers, TCE 65mm TB, CAI, 180* TStat, Milzy motor & tranny mount, 18" BOSS 328 & much more... going osv!!
Silver: 2.4L, 5 speed, GAGT seats, front & rear STB's, all red tails, led headlights, Magnaflow muffler, Milzy Motor mount, WAI, Cosmo short shifter; sold n missed
Tequila: 2.4L, GA interior swap, scrapped...
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