Most consumers don't understand the term. They imagine chickens running around an open pasture enjoying themselves, but in commercial (supermarket) packaging the word "free range" could just mean that the coop door is opened for 5 minutes a day.
Pastured would be a more accurate word, even if its just an 0.97 acre pasture.
Also, people who haven't seen the word "pastured" used on eggs may be more likely to ask questions; that opens the opportunity to explain it, get them more interested, and increase your chance of selling them eggs. (hey, good marketing doesn't just work for the big commercial operations, backyarders can benefit too!)