Which turbo are you using? If it's a tyre-on version you should be calibrating each time.
I try to make an effort to adjust the contact point as close to what is was before, and keep my tires pumped up
Yeah if you can be sure they pressure of the roller on the tyre and the pressure in the tyre are exactly the same then you probably don't need to but those things change over time.
@hippy started
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Which turbo are you using? If it's a tyre-on version you should be calibrating each time.