Whoops... I may have edited this code at some point - which could explain some differences...
here is the virgin 4.1.6 block
Code:
<table width="60" cellspacing="1" cellpadding="2">
<tr>
<td class="SaveMoneyLabel">
<br />
{math equation="100-(price/lprice)*100" price=$product.taxed_price lprice=$product.list_price format="%3.0f" assign=discount}
<span id="save_percent">{ $discount }</span>%
</td>
</tr>
</table>