How many more fills could I expect on a 100 cu ft vs an 80 cu ft scuba tank ?

[cphilip]

...any fills you can get to 3000 and above will be worth the few extra bucks more in intitial investment. At worst case that 30 bucks more for it and when I bought it was like $10 more for it. Remember you can rarely get a 3K fill in a 3K SCUBA tank. You can in a 3300.