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You'll likely see less shots from a tank.
A CO2 is filled with liquid and sold by wieght (20 ounce, 12 ounce)...Think of a soda bottle as a full CO2 tank- mostly liquid, with a gas pocket near the top.
When you shoot, you draw gas CO2 from the tank. Some of the liquid boils into a gas to replace this lost CO2. Boiling is a cooling process, so the temperature of the tank drops; you've surely noticed that your tank and marker get cold after a while of shooting.
On a warm day, the tank is able to absorb heat from the air to cope with the chilling process. On colder days, not so much. As it gets colder and colder, the pressure it can give out will drop. After it falls to a low enough point, you're marker won't have enough power to recock and will act like it is out of air.
If you pace yourself and try not to spray, you won't notice this as much because the tank will have time to warm up again. Things like expansions and remotes can help here, but after a certain point its a deminishing return.
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CO2 tank capacity
