In 2010 the University of Wisconsin-Green Bay switched the default email font from Ariel to Century Gothic because it used 30% less ink to print.

In 2010 the University of Wisconsin-Green Bay made headlines when they switched the default email font from Ariel to Century Gothic in order to save 30% ink when printing emails. The move was part of their 5 year plan to go green and save money. Source: http://www.dailyfinance.com/2010/03/26/university-thinks-the-right-font-could-help-save-the-earth/