Coolant loss after flush

I just did a complete flush and refill on my rescue pony (02 GT) and after a couple of short drives I checked the coolant and the reserve tank was nearly empty. I remember thinking that it didn't seem like the system held nearly the 16 liters that the internet said was the capacity of the system (It took about 9 liters). I had to add over 2 liters to get the coolant back to the fill line. Is there really that much air in this system? Honestly the fact that this engine has no radiator cap makes this all a guessing game.
 
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Not unusual, it can hold several liters of fluid in the block even after draining, and it could take a couple heat/cool cycles to stabilize.
They use a vacuum thing with a gauge to suck down the system at the shop when working in that area, if it holds vacuum for a few minutes then connect a hose that draws fluid from the drain pan to fill it back up, no trapped air.