As XT speedos read about 8% over with a 130/80-17 stock tyre, with a 130/90 the speedo will theoretically be spot on with actual road speed. However, your odometer will under read by 8% or so, as with the stock tyre size the odometer is pretty accurate.

You can't win really. Even fitting a speedo healer can't correct both the distance and the speed readings, you have to pick one or the other to get right. Alternatively just don't worry about it! Get used to how much "out" the speed is an adjust accordingly in in your head.

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