First of all cheers to this great plugin XML Sitemap Generator.
Now the question (probable its having a small answer).
1. I want to know that should i use sitemap.xml.gz and sitemap.xml at the same time?
2. Should i ADD both the sitemaps to Google WebMaster Tools and use them at the same time? Right now i have submitted both.
Right now it shows in GWT that, Total Submitted = Submitted by sitemap.xml + sitemap.xml.gz