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Edge question

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Hi All,
just bought and installed a new to me Edge w/Juice. So far I really like it. good power and I think a bit better milage. Here is the question.. The tire size area... I'm running 35's. I've set the tire size on the edge.. Is this supposed to fix my stock speedo? I know from comparing my speedo to my Garmin, I'm off by 10%. Why is this there if it if doesn't fix the speedo?
Thanks much!
Al in NY