New Guy, I haven't had much problems at all staying in INR range, but then again I think I've had one of those excellent INR managers. She has anticipated very accurately the affect of going on and off other drugs would have on my INR and kept me between 1.7 and 2.7 the entire time I've been on it. Most of the time right around 2.2. And I had learned enough from her that I could have become a self-doser weeks ago. In fact, she'll make a recommendation and ask what I think about it, and in almost every case, it's EXACTLY what I would have recommended to myself. Depending on what you call stable, I've either been stable since the beginning (1.7 - 2.7) or I'm certainly stable now the last month or so (2.1-2.2). I think it probably also varies a little from person to person - some having an easier time than others. If you're on other drugs like I was that affect your INR (things like Metropolol, Amiodarone, antibiotics, etc.), that makes it a little trickier to figure it out at first, but it's still not rocket science. And the thing is, even if you go a little out of range, it's not a big deal, just make a little adjustment and it'll probably be fine next time. That's been my findings anyway, but I know others have had a harder time. Might also have something to do with my fairly consistent diet, but as Ross says, while diet affects INR, it doesn't affect it very much. Most of the things on the Vit. K list aren't significant enough to worry about, and the few that are (spinach, slimfast/ensure are a couple I'd normally eat once in a while) just require a little moderation.
Glad to hear the pro-motorcycle side of things! I think (as usual) Ross sums it up best - if you drive a car, you're also at risk of a head injury, so basically, don't stop living your life just 'cause you're on Coumadin. So I won't let it worry me too much, other than doing the things that are smart anyway (i.e. wearing a helmet).