"Is it worth mounting up for getting over there? Or should i just run? What is the fastest?" Well..
I was bored and did the math (soooo hard math...).
Normal running speed is 100% (x), and epic ground mount is 200% (x*2), while it takes 3 sec to mount (-3).
So that leads us to this: x = (x * 2) - 3
For those two be equal to eachother, x would have to be 3.
That concludes:
After running for 3 seconds (after mouting up), you will have gotten as far as the person running on feet. Total time: 6 seconds.
For 280%: After 4,667 seconds
For 310%: After 4,429 seconds