[I had that same problem but it was my tire size that changed it.I was running yokohama 345/35x15 that measured about 24" tall.I was running 4000 rpm at 80 mph.I have the standard 4:22 gear ratio.I swithed to 345/35 x 18 michelin pilots that measure @ 26 1/2" tall.i now run at 3200 rpm at 80mph.
jeff
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