I honestly don't think this "EMV" stat you're trying to establish will be all that useful..
Things like drag and diffusion are way more important IMO...
For example, I have a möbius clear matrix and reti.
They are supposed to have the exact same form factor, yet my reti is maybe 0.5-1cm taller than the matrix.
(Some quick maths:
75mm can - (5mm wall x2) = 65mm internal diameter =32.5mm=3.25cm internal radius
Area = Pi r2 = 33.18cm2
33.18cm2 x 0.5cm = 16.59cm3
33.18cm2 x 1cm = 33.18cm3
So right there, we have a "EMV" variance of 16-35cm3 between 2 pieces that should be identical.
Then factor in that you can vary water levels quite a bit (let's say 3cm so we can do some more fun maths
)
33.18cm2 x 3cm = 99.54cm3
So if you add the water level variance and the variance from the pieces themselves, you can be varying by up to 130cm3...
Now, going by a graphic in the mobius thread, the can on a clear is approx 6inches = 15cm tall.
Assuming a minimum fill of 5cm, that would leave you with an "EMV" (just for the can, not factoring in the neck) of
33.18cm2 x 10cm = 331.8cm3
So you've got a potential 10% difference just based on the shape of the piece coming out of the factory, and another potential 30% variance based on personal preference of water level...
It just seems too wishy washy to me...
I'm not saying you should give up on the idea, just throwing my
out there...