Miles or Kilometers?

When I first started running, those I ran with (Kim and Alan) discussed running in Miles and that's how I started.

As I started getting enthused though and aiming for a 10k race, I felt more comfortable measuring in Kilometers, the maths was easier and I got updates from Nike+ more often.

 

As I've got into longer distances, I've wondered whether to switch to Miles again.

 

My question is, Which do you use and why?

 

 

 

Does it matter?

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