Sneakylong Agreed... for the most part. With the number of surgeries he's had on multiple parts of his body, the use of pain medication (especially when doing physical activity) is probably a constant part of his life. But as you say, he could certainly afford to hire a chauffeur to handling driving duties 24/7 but...
...I'm not sure that this is about being cheap. I think it is more about personal pride, and how getting over that can be difficult for all of us as we get older. We all think that being able to get by with less than our best is good enough, but when it comes to driving then 90% really isn't good enough. Time for Tiger to wake up and realize that.