Thanks Bruce
I used the Winzip internal viewer and then copied all of the line items for the date in question over to Excel. I couldn't really find anything unusual. This could be a simple error in the stats.
As an example, I will use the site that I did not modify on the 20th.
19th - 40 visitors, 166 Page views, 2730 hits, 12.89 MB
20th - 43 visitors, 914 Page views, 3324 hits, 30.35 MB
21st - 27 visitors, 126 Page views, 2238 hits, 10.32 MB
If there were in fact 914 Page views on the 20th, I would think that the hits would go up in direct relationship to the page views.
The stats that I recorded for the 20th do not show any hits on the new sitemap.xml file, however, Google hit on this file several times on the 21st. My initial comment therefore doesn't hold water.
Interesting, isn't it.
Loren