It was the bottom entry on the list of inclusions — Nitrogen inflation.
I had never heard of that — I always assumed that car tyres are filled with common or garden air. Nitrogen gas just seemed a tad excessive. I looked it up on Wikipedia when I got home, and sure enough, Nitrogen is used — for aircraft!
“Aircraft tires are usually inflated with nitrogen or helium in order to minimize expansion and contraction from extreme changes in ambient temperature and pressure experienced during flight…
…The use of an inert gas for tire inflation will eliminate the possibility of a tire explosion.”
Things are definitely getting worse when a common, everyday car tyre gets filled with Nitrogen gas! The world has gone mad!