Canon TC 21 holds more ink per chamber than you can imagine

I just setup my TC 21 for the first time:

After the ink fill and priming it reported approximately half full

I then was able to take a second set of carts and completely drop them into the printer, every drop emties, bottle bone dry!

I then printed a 24x36 poster, came out beautiful

Since I have many sets of carts I took my next batch ofd carts and 3/4 of them emptied into the reservoirs

That's 180-200 ml of ink that went in with only one 24/ 36 printed

I know ink is piped through the lines but my conclusion is that the reservoirs for each coloe hold WAY more than 70 ml for each color