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Obviously you will get a lower payment if you apply that money to cap cost reduction but you won't get that money back at the end of the term. Not sure how much MF is reduced per sec deposit but I wouldn't think it could be reduced to 0. Could be wrong though...
I have read that each additional security deposit lowers the MF by 0.0001 I think you can do 8-9 Security deposits which will lower the rate substantially.
DO NOT DO THIS! If your car is stolen, you will lose a big chunk of that money. Do the multiple deposits instead. These are refundable, including in the event of total loss / theft.