What is the proper source for the correct tyre pressure?

Answer and explanation

Correct answer: D. The vehicle manufacturer's recommendation

  1. Step 1: The manual or door-frame label gives the right pressure for the vehicle and load.
Answer
The vehicle manufacturer's recommendation.
Why not the others: The highest figure printed on the tyre, The pressure of a neighbour's car and Any pressure between 0.5 and 5 bar don't fit.

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