Think ahead to the month after you've started your ER. (Go ahead, we'll wait here until you're ready to rejoin the discussion.) How would you feel during that month? "Gosh, I'm really glad I took the high road and donated all my extra sick leave to those folks" or "Crap, I can't believe I didn't use a few more of those sick days!"So do I take the high road and just let all those sick days go to waste (there is no incentive not to use them) when I leave?
That's the feeling you'll likely have for the rest of your ER, so choose accordingly.