$.20 per cube is tough...at the range of shops in cave country its $.09 to $.12.
I'm sitting here now wondering if I should do a dive today on my tank with 2000 psi which would have me end at empty in water I can stand up in, or use a full tank which will end at 1000 psi... Doing the former would save me something like $8,but I'll be honest I don't normally work out what the charge is, as long as it's less than the most expensive drink you can order at Starbucks...
The differences do show though when you get more than a few tanks filled at once and I do try to carry extra empty bottles to cave trips just to get the gas, and of course nothing ever comes home empty.
I'm sitting here now wondering if I should do a dive today on my tank with 2000 psi which would have me end at empty in water I can stand up in, or use a full tank which will end at 1000 psi... Doing the former would save me something like $8,but I'll be honest I don't normally work out what the charge is, as long as it's less than the most expensive drink you can order at Starbucks...
The differences do show though when you get more than a few tanks filled at once and I do try to carry extra empty bottles to cave trips just to get the gas, and of course nothing ever comes home empty.