What's Your "Ratio"?

I glanced at my car odometer the other day as I was pulling out of the pool parking lot, and noticed that it read exactly 80,000 miles. Since I've owned the car for almost exactly four years, it was easy to determine how much I've tended to drive during that period.

That got me thinking: How much have I actually ridden my bike over those same four years? How much have I run? Those who know me well would probably guess that I can pull together those exact numbers, but the point isn't to come up with an exact comparison but rather gauge what that bike-to-car (or bike+run-to-car) balance looks like.

After looking back at some old logs, My quick estimate is that I've ridden about 25,000 miles and run about 5,000 miles in those same four years. While the roughly 35-40% ratio between my (ride+run) miles and my driving miles is an interesting figure, I thought it was also worth posing a few questions to the group:

What's your ratio of combined distance traveled on your bike & running in a given week, as compared to how much you drive? Is that an accurate indicator of how you spend your time? Or better yet, is there anything that you can do creatively to bump that ratio up a bit?

All good food for thought...comments welcome!