The only time a route redistributed into EIGRP will pick up the interface metrics is if the route points to a locally connected interface, pretty much. So, if you're doing this:
ip route 0.0.0.0 0.0.0.0 x.x.x.x
Then the default is going to pick up some default metrics, not the interface through which x.x.x.x is reached, or the cost to x.x.x.x. Is this what you are seeing? Could you post the statics that you are redistributing, your EIGRP config, and a show ip eigrp topo 0.0.0.0, if not?
:-)
Russ.W