What size tank?

 I'm thinking about getting a Benjamin Maruader .177, but I don't know which size tank to get. I looked at a 80CF, aluminum tank . It would be 150.00. But how many shots could I get out of that size tank? Would I need to get valves or adapters to fill from it? I found a Marina that will fill to 3300 psi, that's only 26 miles from my home. I could use any advice you could give me.
 
Hope this helps , go to a fill calculator bottom of yellow forum or AoA you have an 80 cu/ft tank and a 215 cc? fill. You'll benefit from the .177 as I've read of tunes that work well with a 2500 psi fill. 3300 is over the 3000 psi that most tanks use.(never owned an aluminum tank) The carbon fiber tanks spec out to more than 60 fills for the Marauder at 3k to 2k. Do some calculating and figure your cost per fill traveling times, fuel costs then decide. I have a dive shop that fills to 4000 psi. It works out to twice the fills when the tank is filled to 4500 psi If in the your future is a more powerful gun take that into consideration