SteveMillerTime said:You are correct, you lose pressure not volume when the tank gets cold. However, when you lose that pressure you can no longer push the beer out. By leaving the bottle outside where it can remain at room temperature you'll be able to push more beer.
It all comes down to molecules. Warm/Hot molecules move faster (more pressure) than cold molecules. So in theory, by having a colder tank you are reducing how much beer you can push.
If you want proof, run your tank cold until the gauge says you're low on pressure. Then take it out and leave it to get to room temperature (assuming your temperature is above 50*F) you should see a significant increase in gas pressure next time you turn the tank on.
Sorry but this is just not true at ALL! Been a while since boyles law, but the amount of co2 in the tank doesn't change cold or warm. Well ok maybe a warm tank would push another pint...Is that your point?
By the time your tank reaches line pressure it is virtually empty...and yes a warm tank would give a few light puffs more.
Tank pressure means very little...the amount or weight of gas in the tank means everything irregardless of temperature.