Function G_DISTANCE(Origin As String, Destination As String) As Double
' Requires a reference to Microsoft XML, v6.0
' Draws on the stackoverflow answer at bit.ly/parseXML
Dim myRequest As XMLHTTP60
Dim myDomDoc As DOMDocument60
Dim distanceNode As IXMLDOMNode
    G_DISTANCE = 0
    ' Check and clean inputs
    On Error GoTo exitRoute
    Origin = WorksheetFunction.EncodeURL(Origin)
    Destination = WorksheetFunction.EncodeURL(Destination)
    ' Read the XML data from the Google Maps API
    Set myRequest = New XMLHTTP60
    myRequest.Open "GET", "http://maps.googleapis.com/maps/api/directions/xml?origin=" _
        & Origin & "&destination=" & Destination & "&sensor=false", False
    myRequest.send
    ' Make the XML readable usign XPath
    Set myDomDoc = New DOMDocument60
    myDomDoc.LoadXML myRequest.responseText
    ' Get the distance node value
    Set distanceNode = myDomDoc.SelectSingleNode("//leg/distance/value")
    If Not distanceNode Is Nothing Then G_DISTANCE = distanceNode.Text / 1000
exitRoute:
    ' Tidy up
    Set distanceNode = Nothing
    Set myDomDoc = Nothing
    Set myRequest = Nothing
End Function