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4.10 to 4.56 is pretty much 11%
So if you are at 3k rpm at a given speed, 4.56 would be about 3,300rpm. Maybe that will help you imagine what rpm you would be at with a higher final drive.
4.88 is is about 18% Let me know if you find out the rpms at 80mph for all the different final drives. I am too lazy to check right now.
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