Go: Save edited read-only files in vim

Will you be as often as I do this scenario: Editing a System configuration file in vim and discovering that the current user does not have permission to write to the file when it needs to be saved. If you have made a lot of changes, discard the save is really annoying, had to first save in the user's home directory, and then use the sudo mv moved to the original location of the file, and as required Chown. This is too much trouble, the following technique is too convenient. When you need to save, enter the following command:

: w!sudo Tee%

Go: Save edited read-only files in vim