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The top gear ratio is the same on the 5 and 6 speed transmissions on the Vibe. It is .725:1. The final drive is taller on the 5 speed though. Therefore, cruising on the highway you would be better off with the 5 speed.
You could swap in a C59 from an 98-02 Corolla. It has .725 5th gear and 3.722 differential gearing.
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