martinibuster - 2:58 pm on Mar 25, 2013 (gmt 0)
I just finished testing larger fonts plus several different ad sizes and my results indicate that increasing font size contributed to higher AdSense Revenue, regardless of which ad unit I used. I switched different ad units to settle on the highest earnings but ultimately ended up back at my original ad units. The earnings are up and the only change is the size of the fonts. Smallest fonts used were size 10. Went up several sizes across the board. Not saying this will help everyone, just sharing my experience.