Sand tiles influence on stamina

[Enjoyment]

So, here is my little observation.
When you running on sand tiles (lakeshores), your stamina drains quicklier then running in forests and much quicklier then grassland. So it states "sand is not for running".
When you pulling a cart, you can't run in forests, but can run in sand, and your stamina drains equal to grassland running. And it states "sand is perfect for running with cart."
Is it suppose to be so?

[Kaios]

I don't think you lose more stamina running on sand than you do on forest

[Enjoyment]

I don't think you lose more stamina running on sand than you do on forest

Maybe not more but definitely not less. And the 'bug-thing' in this thread is stamina drain of running with cart. If you can't run with it at forests, you shouldn't be able to run with it on sand, IMHO ('cause it looks wierd now).
UPD: My bad. Was trully sure, that sand is a rough terrain, but was completely wrong. It drains stamina like grassland, so whole the topic is a crap. Sand it to trashbin.

[jorb]

Resolved, then.