Internal Program Version: xz  5.8.3

The xz command is a program for compressing files.
* Average compression ratio of LZMA is about 30 percent better than that of
  gzip, and 15 percent better than that of bzip2.
* Decompression speed is only little slower than that of gzip, being
  two to five times faster than bzip2.
* In fast mode, compresses faster than bzip2 with a comparable
  compression ratio.
* Achieving the best compression ratios takes four to even twelve
  times longer than with bzip2. However, this does not affect
  decompressing speed.
* Very similar command line interface to what gzip and bzip2 have.

http://tukaani.org/xz