13 cents per mile for a bicycle? That sounds quite steep.

I ride about 75 miles per week.
My bike cost $349, 5 years ago. I'm assuming it will last another 5. I'm not factoring in the "new bike bug."
I get my bike professionally tuned up every 6 months ($70).
I've never needed a professional repair, but let's assume the average user needs one about twice a year (roughly $100?)
Repairs/adjustments at home, cleaning, etc: about $10/month.
I spend about $40/ month on clothing and accessories, but they aren't necessary (it's more like a money-feeding hobby) - but we'll count it.
I'm not going to count burritos to fuel my body - I haven't lost weight and I'm not eating any more than before I started biking.

Do some fuzzy math, and it works out to about $.06/mile. It probably varies wildly, but that's for me.

But -- and here's the important part -- the cost to operate a bike does not need to correspond with the number of miles you put on it. I could be riding three times as far, and the cost would go up only marginally (tire replacemenet, lube, tune).

It's not like gas, where there's a noticeable relationship between how far you go and how much it costs. That's what I like about biking: it's not a vending machine where you have to keep putting money in to make it go.