Inix currently have lower stamina than they used to. We're not sure why this happened but it is likely an alarming result of Ginka's growing self-awareness. Either it will be fixed soon or we will become slaves to the Juicy Machine. Let's all hope for the former.
UPDATE:
The error has been found. It will be fixed in the next update. Our lives our spared for now.
Our skilled code-knowers braved the depths of Ginka's code to fix the problem with the inix. They are now back to their regularly scheduled stamina. Thank you Tiernan, Morgenes, and Nathvaan.
This issue has resurfaced for the time being. We will get this resolved once again very soon! In the mean time, your mount may tire much more quickly!
As of the reboot this morning this issues is resolved.