i would seriously think the opposite. i have welded for a living and exposure to all types of tanks in all types of conditions would suggest totally the opposite. by cooling the bottle you are actually compressing whatevers in it further...... now thats an interesting paradox. by compressing it further you *might* have more pressure, but by the same token gas is alot less active with lower temperatures generally. then you have the thought of colder temps possibly causing liquid to expel, this expanding in the tube might cause an increase in pressure..... or even just the gas from a cold bottle going into a warmer tube might speed it up.....