QUOTE(Fudo Masamune @ Feb 2 2019, 14:08)

what I really don't understand is people who refuse to spend a little time to understand other's perspective yet have time to diss their effort. ¯\(ツ)/¯
Straight back to you, no offense. You're actually the one who doesn't understand his real issue, nor even what is the actual use of your own numbers, hence my reaction. And you're not thinking even two seconds about the reason why I've stated that either.
I do have understood
why he wondered about XP/round it in the first place, but I'll admit that I did not bother answering it simply because I did not feel like to. That much I can be blamed for. Do you even know yourself why you've apparently spent time to calculate such numbers? I mean, have you ever asked yourself why one would want to optimize his XP/round? Perhaps a bit, but not hard enough.
Allow me to elaborate the reasons why I said that such numbers are useless, and why his initial wonder is questionable just as well.
So, let's start with why "XP/round" is a rather useless number. It's true that all arenas are more or less efficient regarding that matter, that much can't be denied. But given the arena compositions and the XP multiplicators, unlike you I don't need extended calculations or benchmarking to see that following the order 80/100/90/65/60/75/70/55 for the 2nd page of arenas is already good enough. All I need is the wiki that describes the XP multiplicators and round compositions. D'you know what?
The order in which one plays the arenas is all that matters when one wants to optimize his XP/round ratio. Just play arenas in that order and you know you're more or less along the lines. That much solves the issue, so anything beyond that is useless. Want to include the SG arenas? Just toss 150/110 in the front and call it a day too.
What about his matter, that consists in staying at 80+ stamina? Just do these arenas: 100+90+80+75+70+65+20 = 500 rounds = 20 stamina. Then crack an ED, then 150+125+110+60+55 = 500 rounds = 20 stamina. Assuming you have the "Long gone before daylight" perk, otherwise make it two EDs. That way you'll be at 100 stamina everyday when starting the arenas and you'll remain above 80 stamina at all times. You'll fail to regenerate 4 stamina per day though.
What if you just want to max out your XP income without ever using any ED? Just do all the same arenas I've stated, but by being below 80 stamina! You'll get more XP
and more credits+drops that way than just doing 100+90+80+75+70+65+20 while being at 80+ stamina.
What if you want to benefit from the 80+ stamina bonus to its fullest everyday without chugging EDs? Then you need to spend 24 stamina everyday, thus 500(25*20 stamina)+200 (50*4 stamina) rounds. It makes 150+110+80+100+90+75+70+25, so pretty much all the second page arenas from top to bottom till the 70 rounds arena, excluding the 125 rounds SG arena. This method is the most efficient one of all.
Bonus: if one wants to do as many arenas as possible everyday without ever chugging energy drinks, then one has to do 1200 rounds everyday, which corresponds to almost all arenas with 30+ rounds. This isn't XP efficient, but at least it's roughly equivalent to doing 500 rounds everyday while staying at 80+ stamina. ... except you earn way more drops and credits
Conclusion 1: in all cases, calculating the XP/round of arenas is pointless.
Conclusion 2: optimizing the XP/round is contradictory. In other words, it's futile considerations. If you want more XP, then just play more
and chug energy drinks. If you don't want to chug energy drinks, then just play the game, clear enough arenas to use 24 stamina everyday.
Conclusion 3: doing just enough arenas to stay at 80+ stamina, without ever using energy drinks, is completely inefficient.
=> If one's issue is more about time but you want to XP at its best, then just playing the non-SG arenas in the 2nd page of arenas, starting off the 100 rounds one, then 90, 80... should be way enough.
So now, I'm saying it again: the XP/round is a useless number meant to solve issues that don't even exist in the first place. And trying to stay above 80 stamina at all times is inefficient just as well, if one isn't ready to use energy drinks big time. The only existing issues are:
1) How to profit from the x2 bonus provided by the 80+ stamina to its maximum everyday
2) How to get the most XP possible out of your time at hand
To those issues, the answer I've given here.
So fudo, contrarily to what you may think, I do appreciate your efforts, your dedication to calculate, benchmark things and all, and your will to help answering questions. I hold you in high regards for that. And still contrarily to what you seem to think, I don't spit things out of nowhere just to be a troll. I do have quite a lot of knowledge regarding this game myself, even if my favorite fields are completely different than yours: practice, player behavior and thought process, market tendencies, or off-meta.
Because I've understoood veeeery well what Saioux's real issue is, allow me to ask him this: why do you even want to max out your XP income in the first place?
TL;DRThis post elaborates on why calculating XP/round is a completely useless matter and why trying to stay at 80+ stamina at all times is not necessarily a good thing.