>> Matt-
   >
   > And to play the green card, how efficient is your compressor, your power
   > lines and your coal fired generators etc. Also a real B if you run out of
   > air and air drives tend to be very noisy.
   >
   > John

   John
   I wondered about that; as well as my compressor only goes to 800 - 1,000
   psi. I wonder how they get the 4,500 psi, bloody BIG compressor I suppose.
   One thing which is a bonus here in Aussie, we don't have to pay for air (at
   the servo) unlike you chaps in the USA. It might cost as much to fill with
   air, using this system it may be you pay for gas in the US. Mind you we pay
   more for the fuel. We have been paying $1.50 ( Aust) a Litre, that's about
   $1.30 US a Litre  There's 3.8 Litres to a US Gallons to so that's $4.94
   a
   gallon.
   Are you anywhere near that yet?
   George (down under)

Smaller compressor more PSI less CFM, larger compressor more CFM less PSI.

Dan