Except that on the video that guy is not making a straight line from A to B in Skyrim, he goes around mountains just as the guy on XCX dont go straight. I´m not saying that the video is accurate though, probably is far from accurate, but your comments look far from accurate too.

That's as close as you can get tbh, the maps are shaped differently with different type of landscapes, from the video it seems XCX has far bigger land mass though and that's with out the vertical side of things as well.

Maybe flying? Can someone use a flying mod of Skyrim and the robot of Xeno and just compare the two maps crossing the diagonal of the map?

As stated, the guy playing XCX starts at the top, goes to the middle, diverts to the far right then goes to the far left then back upwards, , essentially taking the longest possible path you can take, that's compared to a (sans slight diversion to take mountain path) fairly straight course, I've played both games extensively. I'm familiar enough of the world maps to see that the video is at best, trolling and at worst bullshit.

Hence why I did a comparison against direct line on sea for both, as the doll non boost speed is the same as the character sprint speed, which is 2x running speed, which puts the gtav jetski at as close a speed as you can get given the difference in planet design.

Actually in terms of content Super Mario Maker is actually the biggest. Even with the shortest levels uploaded being 10 secs to beat, you can literally play this game NONSTOP for YEARS

That may be true, but it is still friggin' tiny compared to Minecraft. =D

The only flying mods in Skyrim are using Dragons like the transport wagons you can't actually control them as the engine has trouble because it would have to render far more then it's coded to. Flying also is more inaccurate then travelling the land tbh. The maps were the exact same shape then maybe but as it goes this is the closest anyone can get.

So i got out the calculator and did a whole bunch of tests for various speeds and walking/jogging/sprinting speed, and this is what I end up with.

Map is claimed to be 400km/sq

Map with that size is then, 29km wide by 14km tall, so we can calculate, from the direct line speedrun, that:

Claimed Doll speed (Boosting) 116.4204 mph / 187.3605 kmh 
Claimed Doll speed (Standard) 75.1009 mph / 120.8633 kmh

Sprint speed   (Predefined distance ingame) 1.25s A to B = 25.88 mph / 41.65 kph (12.94x speed of walking)
Run speed      (Predefined distance ingame) 2.22 A to B  = 14.58 mph / 23.46 kph (7.29x speed of walking)
Walk speed     (Predefined distance ingame) 16.18 A to B = 2 mph / 3.21 kmh

Based off of the claimed map size versus doll speed in relation to that map size, we can calculate the following for land based doll movement.

Doll Run speed      (Predefined distance ingame) 1.15 = 28.2 mph / 45.4 kph (14.1x speed of walking)
Doll driving speed  (Predefined distance ingame) 0.2s = 161.6 mph / 260 kph (80.8x speed of walking)

What we can do is compare point to point distance on a beach, both in the water boosting, and in the wheeled vehicle mode along the same stretch, the results are that the driving speed is the same as on-water boosting, which means that the speed of 187.36kmh based on a map size of 400km/s, is wrong, and the true speed is actually somewhere around 160km/h, which means that the top to bottom distance is really 7.4288 miles / 11.96 km, thus we can work out from that, that the true width is then roughly 25.2km, making the total map area actually 301.392.

If we take the entire claimed 400km/sq map of XCX and blank out the land then pixel count, we find that only 14.7% of the map is actually land, meaning that the true map size is 14.7% of the claimed 400mk/sq, thus XCX's map playable land is 58.8km/sq (if it were infact 400/sq km)

But if we take the actual map size of 301.39km/sq and apply the same 14.7% land mass calculation what you end up with is a playable land mass of 44.3km/sq, when you consider that GTAV is known to be 30sq miles / 48.3km/sq of playable area (including underwater areas), you see that if you count land-only playable area, GTAV is basically the same size.

It's still impressive, but nowhere near as big as people are clammoring to claim it is. as for their claim of 400km/s, likely at some point or another they allowed you to map-loop (go off the top and enter the bottom), but later on added the barrier walls around the extrimities of the map, thus pulling it's overall size down to 301km/s, however even if they had left the map loop in place, the area beyond the barrier is still just water, so the overall land size would still be around 44km/sq.

I still maintain though that the world feels smaller when you're actually playing, because it is designed really quite barron, the open areas don't scale well with the actual size, in part because of the running speed, and in part because the geometry is low poly when scaled next to a normal player character, when you get a doll the world feels "correctly proportioned", and in turn, ends up feeling 5x-7x smaller as a result.

Oh, and one last thing that bugs me about the ops video, the guy talking claims that the doll in XCX is covering a mile "every couple of seconds". to do that, the doll would need to be travelling at the following speeds:

2 seconds: 1800.0000 mph
3 seconds: 1200.0000 mph
4 seconds: 900.0000 mph
5 seconds: 720.0000 mph

When in actual fact, the doll, boosting, covers a mile every 36.21 seconds.

Dang, I dunno if I'll ever finish this game, haha..

I'm hyped, hope to find this game on the NX E-shop, lets just hope this time bigger=better, Xenoblade has a really good reputation so I have my fingers crossed