Look for the following in your xlResults.aspx file:

<a href="http://maps.yahoo.com/py/maps.py?csz=<%#Container.DataItem(6)%>&addr=<%#Container.DataItem(3)%>&country=us">

Replace above with:

<a href="http://maps.google.com?q=<%#Container.DataItem(3)%>%20<%#Container.DataItem(4)%>%20<%#Container.DataItem(5)%>%20<%#Container.DataItem(6)%>">

Note:  Make sure the code is on a single line.