A 20oz co2 tank will on average shoot about 1000 shots. This will vary if you have a response trigger, cyclone feed or regulator on your gun.
The number of shots provided per tank is really dependent on the tanks size. I am the captain of the Bullit Paintball team, and I usually use a 20oz tank. With my 20oz I will get anywhere between 800-1000 shots, depending how fast I shoot. I would say that you'll usually get around 500 shots, and a max of 600 shots with your 12oz.
Depending on your marker, but you should get 500 to 700 shots.
A Tippmann 98 custom 20oz co2 tank shoots 1100 paintballs
It depends on the temperature and how clean your gun is, but around 1000.
It depends on how full it is and what the temperature is, as well as the guns efficiency. You can guess however that: a twelve gram can shoot around 30-35 a 9 oz can shoot around 500-700 a 12 oz can shoot around 800-1000 a 20 oz can shoot around 1000-1200 a 24 oz can shoot around 1200-1500
I have a spider sonix,and I can shoot probably about 1000 before it gets low
I use a 12 ounce, it lasts me a full day, but you might need a bigger one (20 ounce) if you shoot a lot of balls (eg. automatic firing) Tanks are a lot of preference but largely the 20oz is the standard co2 tank that will offer on a typical entry level setup about 1500 shots. For HPA whatever size you get, get it in a 4500 psi tank, that way you will get more shots out of the same size tank. The 68/4500psi has largely become standard for HPA tanks and will give you around 1300 shots on an entry level setup
Very roughly: 1100 shots.
It depends on the size.