Speedometer correction?

I’ve used speedo healer and speedo DRD and both are effective. Healer is a little easier to use, but DRD is less expensive and I think worth the savings.
 
If you know it’s 91 when the speedo reads 100 what’s the point?
At different speeds it might be a different figure that it's off.
I know with all the excitement going on, one could forget 100 is actually 91. I know it would bother me to have the speedo off and I'd use one of these products to fix it.
 
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