If I have a 401k and and my fees are as follows. An index fund will cost me .77 per 1000 invested and a managed fund will cost me 3.21 per 1000 invested. Lets say over the that time span the managed fund returns at 12% and the index returns at 10% If you are putting in say, 1000.00 a month how much is the difference in the end, would it be a couple 100K or am I missing the boat somewhere? Or if anyone has a fee based planner that could answer my question that would be good too. I know I=PRT and that is about the breadth of my interest skills.