I know my rate was higher than that... Mostly because I bought my bike and started commuting this year. So I have all the misc clothing, bike accessories, etc. that I got. I'd bet I'm closer to $2/mile. My mileage was down just under 1000 I think.

Some of those costs won't be present every year, but some will. Gloves for example, I bought three pairs last year (as the temperatures changed). However the warm-weather gloves I bought are nearly worn out (starting to get holes). I probably won't buy 3 more pairs this year, but I will definitely buy 1 and maybe 2.