My manual recommends 15. I think its a little high and it feels like its sliding more than it should when I put that much in it. But if you have a leak then it would probably be ok after you lose some over the course of the day. Just what the manual suggests. Maybe someone else can help more
Grab a bottle of "slime" at your local wal-mart.
Or better yet get a new tube!
It really sux getting a flat out in the middle of nowhere, seems sorta silly going out there KNOWING your going to get one for sure!
Play it safe. :thumb: