The gas pressure in the cylinder precisely depends on the temperature at which the cylinder is being filled. In case of technical gases cylinders are filled up to the pressure measured at the temperature of +150 C.
The above relations concern compressed gases only. It is worth to know that for gases in liquefied state the pressure in cylinder does not affect substantially the extent of the filling of gas cylinder. Besides, the result of those calculations performed in non-laboratory conditions can be considered as an approximate only (for general information purposes).