Hello Alfie

Maybe, it depends on the standard settings of the mobile browsers …

Hhm. Do you know a source stating which mobile browser don’t support it?

No, it's a hypothetical thought.

Makes it any difference to serve an minified or unminified file to gzip?

I does (size in byte):

style.css.gz       6,439 -82.8%
style.min.css.gz   5,191 -82.1%
                         -19.4%

Ouch, around one and a half Kilobyte.

Tschö, Auge