This is just not true. I usually only inflate every 2-3 rides (unless I've done a particularly long ride). I have on numerous occasions fixed a flat with CO2 and had plenty of pressure in the tire for another ride or two (I like to keep them pretty hard too).
Could it be that you are underinflating? If you are not careful with CO2, you can lose a fair amount of it trying to inflate the tire... if you are underinflated to begin with, you are more likely to flat. Also for some reason tires seem to lose pressure faster when they start from a low pressure (not sure why, but it seems to happen).
I love my CO2 pump.



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