Paints and airbrushing

Posted in Custom Workstation

This is something that has me quite intrigued...
Normally when I use the airbrush, I use cheap acrylic paints (anyway they are for my own customs, not selling) of those that come in really big amounts; but I have noticed that it takes quite a bit of paint to make the proper mixture in the airbrush´s recipient.
I was planning to begin using paint of higher quality like testors or tamiya but noticed the recipients are practically the same size of the airbrush´s paint recipient. So it doesn´t make much sense for me that I would spend a whole bottle of testors in 3-5 times I use the airbrush.
I know they do last for a long time if use use regular brushes, but is there any measurement or tip you can give so I don´t use the whole bottle in 3 or 4 applications when using the airbrush?
Any thoughs will be highly appreciated.