As a normal fleeter i do not let me stash get under 300 mil..i never worry about the cost to miss or hit..i never been a technical kind of guy.
*edit* not pushing for the top like on extreme..its lonely up there anyhow LOL..if this had cost me 1 bil in the hole..i still would have done it.Sometimes..its just about the person you are trying to catch

*2nd edit* Robs cyclers cover another 4bil of each for me too btw which is not in the original post