You have four day elements so
<xsl:for-each select="day[position() > last()-3 and position() <
last()-1]">
is
<xsl:for-each select="day[position() > 1 and position() < 3]">
The first clause isn't a constraint as position is always greater than 1
so this is
<xsl:for-each select="day[position() < 3]">
so you just select the first two days then sort them in descending order
of cl and take the last in sorted order, so that would give
6500
You said you wanted 6200 but haven't specified the transform that you
want to produce taht so I can't suggest changes to teh xsl.
David
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