Uh, not really. Here's the game's documentation:
"12. Miles and kilometers
We sometimes write miles and sometimes kilometers. We hoped that people in the US and other 'miles countries' will read the miles sections and others the kilometers sections. (Just joking).
In fact, it does not matter. The numbers can be seen as both. If you count in miles, your country seems bigger and missiles and airplanes go further but reach the same targets. If you count kilometers, your world is smaller but with no consequences, as everything looks the same."
And call me T. Wo.