Below is a chart of my findings (each using the highest available compression format):
|Format||Size||Compression ratio of Original|
|Original file||58,412 KB||–|
|Windows Compressed Folder||27,247 KB||46.6%|
As you can see, using the .7z format gives a substantial improvement in compression over any of the other formats.
I hereby highly recommend 7-zip!
Disclaimer: Results will vary with different content! !