Edison and Danitrio pens are my 'core' writing pens... nibs range from true Japanese EF & F style, to JoWo EF. Kept a log to determine how much ink I use, and it averaged 50ml every 5 weeks during intensive writing times. My log was helpful in convincing my beloved that fountain pen ink should come out of the household budget, much like printer toner does.
I know a couple of folks who 'blow through' 50ml in 2 weeks... writing exclusively broad nibs!
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