Pesos vs US Dollars in TJ
In my experience, if you are going to spend a lot of money, pesos in absolutely the way to go. Let us say the conversion is (it changes all the time) is $10 US = 110 pesos. Now when dealing with " people" if something is say 200 pesos they will want $20. 00 US which is 20 pesos more ($1. 10 US). That seems small and it is but if you are there for a few days or a frequent visitor and spend say $500 US by using pesos you would have saved $27. 50. Thats a free streetgirl. LOL You save even more through any tipping (cause you can beat them at there game and act like you do not know your being cheap). Now if you are going to spend $50-$60 US once then it might not be worth it to you. When my dumb ass goes for extended stay trip I spend over $1000 US. That is chicas, smokes, food, hotel, drinking and shopping. They do sell more then chicas there. Carton of cigs are less then $13 dollars US. Now we are talking around $60 U. S savings. Still not enough to fill your gas tank now days but why give it to them?
So really depending on your spending is what you should do. One last benefit from using pesos is look like you have been there before and will be treated better. Being treated better adds to your savings.
Just my two cents.