[hoosierglass]

Adding to the thought process here....

instead of this in minicart.tpl:
{include file="currency.tpl" value=$minicart_total_cost}

This value is assigned through the minicart.php file via
$smarty->assign("minicart_total_cost", $MINICART["total_cost"]);

What I am needing to display is:
{include file="currency.tpl" value=$cart.display_discounted_subtotal}

This is from /modules/Fast_Lane_Checkout/cart_subtotal.tpl
But I do not know what php file assigns the cart.display_discounted_subtotal or how to incorperate it into minicart.php