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The best idea would be to buy yourself a gauge so you can check your pressures before you set out. That would also add consistency to the checking, using the same gauge, and eliminate the possibility of striking an inaccurate gauge at a petrol station.
After 150km the warming of the tyre would be significant (not huge) due to flexing of the tread as the tyre rotates, and it becomes a guessing game as to what the "real" cold pressure is.
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