MPH instead of KPH ?

I recently received my #3 kit. I am new to Arduino so have spent the last few days trying to learn the basics.
I have the megalogger code loaded now and logging to an SD card.

I noticed everything is setup for metric (kph etc).
I would like the data in US measurements (MPH, miles etc.).

I looked through the code and libraries but could not see a simple switch or #define anywhere.
Did I dfrobot it or is it something I am going to have to try and work out myself?

Thank you for any advice you can give.