Tramp: creating new files with 0644 permissions rather than 0664?

[egarrulo]

When I create a file with C-x C-f (ido-find-file) in Tramp, Tramp 
creates the file with 0664 permissions instead of 0644 permissions.

Here is the relevant configuration:

(setq tramp-default-user "myuser")
(require 'tramp)

How can I make Tramp create new files with 0644 permissions?  Thanks.