We haven't been to Mexico since 1993. I've asked a few friends who've gone to Mexico in the past few yrs, 50/50 on using both.
I remember it was best to use US dollars when haggling on items. Now I don't know.
Should we be getting Peso's and small American money?
<img src="http://www.traveltalkonline.com/forums/images/graemlins/dine.gif" alt="" /> to Corona