Ci vs. Cu. ft. Air tank !

Ci means cubic inches therefore a smaller unit of measurement than Cu ft or cubic foot. Do the math, a 90 ci tank is just a fraction of the volume of a 75 cu ft tank. To compare in the same units a 75 cu ft tank is a 900 ci tank or a 90 ci tank is a 7.5 cu ft tank. So the 75 cu ft tank is 10x the volume as the 90 ci tank. To put in perspective, the 90 ci tank will give you an outing of shooting and a 75 cu ft tank can give you a weekend of shooting. So if your drive is long, I would get the largest tank you can get. If I was to have a compressor on hand or the ability to fill "at will", I might get the smaller tank. Before you purchase the smaller tank be sure to contact AirHog and make sure you have the right fittings for pcp's. You may have to purchase a new valve and hose to fit you rifle. Check out Ztfritz's posts on these tanks.
Hope this helps with your decision

Doc

"ci" equals cubic inch, "cf" equals qubic foot should be faily easy to see the measurements are NOT the same.1 cubic foot = 1728 cubic inches
a 6,000psi tank is likely 344+ CF and weighs over 150 pounds.

Most scuba shops really do NOT like running there compressors much past 3,400psi ( fill of a common Faber steel scuba tank) they "could" fill highbut it is a lot more wear on the machine, and some shops only have cascade tanks ( like the 6,000 you mention).

There are several fill station maps online, call everyone in your area.

Note if your paintball shop " thinks" inches and feet are the same thing it is VERY likely they will not want to fill your 75CF tank.

Personally "I" think I am headed for a shoebox compressor as a 4.500psi fill at a shop would mean a 50 mile drive one way AND, $40.00 (WOW ) a top off, NOT what they said originally so everyone DO make sure you can get a fill before going CF.
I do like my steel 3,400psi 120 cf tank, fair psi and lot's of volume.



John

Copied this from Joe Brancato's site http://www.airtanksforsale.com/. Lots of info available.

Just because a paintball shop says they fill a 68 cu in tank to 4500 PSI doesn't mean they will fill these large 88 Cu Ft (550 cu in). (And no, if you do the math, 88 Cu Ft does not equal 550 Cu in). 88 Cu Ft is the initial volume of air compressed into the tank, 550 cu in is the volume of water the tank would hold.  Ask if the paintball store if it will fill a 550 cu in tank.

The paintball store is just trying to make a sell. If you have 3 rifles that use allot of air that 90 cu in tank isnt going to last more than a few fills then you will be right back at the shop getting it filled again. Even if you just fill your boss to 3,000 psi that 90 cu in tank will not give you 6 fills. If you fill the boss to 3200 psi you will get less than 4 fills. Dont buy a small tank you will be very sorry you spent the money

my math is incorrect as spysir pointed out. There are 1728 cubic inches in 1 cubic foot. To convert cu ft to cu in, multiply cu ft by 1728 

I don't own a shoebox but the people that have them talk very highly of them. Don't overlook their simplicity, it's always a plus when rebuild time comes.

"scubajeeper"I don't own a shoebox but the people that have them talk very highly of them. Don't overlook their simplicity, it's always a plus when rebuild time comes.

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if you don't have a oilless low pressure compressor to feed the Shoe box already you will have just about the same amount of money in them as Omega.You will also need a dryer for either of them