Dutch company Printer.com ran a test of several popular fonts to see which used the least amount of ink.

Here are the rankings, starting with the most ink-friendly:

1. Century Gothic
2. Ecofont
3. Times New Roman
4. Calibri
5. Verdana
6. Arial
7. Sans Serif
8. Trebuchet
9. Tahoma
10. Franklin Gothic Medium

The difference can be substantial — Century Gothic, for example, uses 31% less ink than Arial, according to Printer.com.

But there is a catch: Some of the fonts that use less ink, including Century Gothic, are wider than those that don’t, meaning you may use more paper by switching fonts.

For example, there’s Ecofont (free download here), which places dozens of tiny white dots inside each character. The result is fuzzy but readable text that uses less ink than a standard font.

Because of the white space, Ecofont is meant for internal or personal use and works ideally when printing in 9- or 10-point type (12 at the most). Any bigger, and the ink-free dots become more apparent.

Another example, GreenPrint’s EverGreen font (on sale for $10) focuses on saving paper. EverGreen uses thinner characters, with less space in between, so more more words fit on each page. Compared to common fonts like Arial and Times New Roman, GreenPrint says the font reduces paper use by 15-20%.

As with EcoFont, EverGreen is readable, but not pretty. It’s best for personal or internal company use.