Gzip doesn't seem to store the encoding information, so you'll have to decode() the result.
perl -e '
use IO::Uncompress::Gunzip;
use Encode;
binmode(STDOUT, ":utf8");
open my $in, "<:utf8", "umlaut";
$_=<$in>;
print "Uncompressed: $_ ",ord($_),"\n";
my $gin= IO::Uncompress::Gunzip->new("umlaut.gz");
binmode($gin, ":utf8");
$_=<$gin>;
print " Compressed: $_ ",ord($_),"\n";
$_ = decode("utf-8", $_);
print " Decoded: $_ ",ord($_),"\n";
'
Output:
Uncompressed: ü
252
Compressed: ü
195
Decoded: ü
252
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