Gill @ tirerack said our method is better.
It follows my fav principle: KISS
Never thought KISS would be in wikipedia but there it is... how simple!
Anyway, has Gill been wrong yet? Plus it's cheaper for us in in Canada.
To test, I guess you could let some air out of a tire and see what happens. Maybe do it when you are very near an air machine that works (many gas stations have air, but they don't work, or they want our loonies...not that they are worth much right now)