Originally Posted by stapfam

You may find that the CO2 will leak out of the tyre quicker than normal air---According to a thread that ran a few years ago- so just top up from the floor pump and don't bother changing it.

But the real question that we should be answering is "When was the current Air put in the tyre before the Flat" Those of us with experience have learnt that Summer air is Lighter than winter air- so did you change the air in the tyre at the end of Spring? The flat may have come from that heavy Winter air.