Peter wrote:

Hmmmm.... that's about average I suppose. I have only destroyed one tyre
in about 25 years of cycling. Seems like a bit of a waste of energy to
cart around with you. A thornproof tube might be more useful on some
back roads.

If you go offroads in the Cape York area, you do need spares. It would
the same in any place with hard woody shrubs that get burnt to the ground.