How can i calculate the difference in power consumption in a day (8 hours),if i have two compressores on hand?

by ajesh
(Bangalore)

Compressor 1:
Max working pressure :9kg/cm2
tank capacity :270liters
FAD :25CFM

Compressor 2:
Max working pressure :9kg/cm2
tank capacity :500liters
FAD :110CFM

The actual air requirement is 13 cfm

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Bill says...

If I needed that info, I'd put a meter on each line that would tell me the consumption of each.

Bill