Tire pressure question

I have used this method numerous of times, a good "Rule of Thumb".

Neat method for sure. Pay close attention to the word of caution at the end.... it alludes to the fact that underinflation can definitely cause overheating, especially at highway speed. I watch this carefully on the heavy trucks when loaded especially....don't want to do damage that cant be undone... A trip to the drag strip is a completely different story...