Cut Printings Costs by Changing your Font
https://www.cnn.com/2014/03/27/living/student-money-saving-typeface-garamond-schools/index.html
https://www.theguardian.com/sustainable-business/font-cuts-printing-costs
https://www.staples.co.uk/knowledge-centre/features/how-much-could-your-business-save-by-switching-fonts.html
Then he measured how much ink was used for each letter, using a commercial tool called APFill® Ink Coverage Software