People go out of their way to try to speak your native language, even if they really, really don't speak it. Hee.
The "backfill turkey" was actually really good. Worth all 165 pesos.
Even if your Spanish is pretty lousy, you should definitely use it. Folks are pretty patient if you struggle; using Spanish shows respect; and your dinner will sound more appetizing in Spanish than it will in mangled English.
mmm well the Regiomontanos (monterrey people) are kind of special, but as a tourist they´ll treat you right, about tips here in México we´re used to give the 10% of the bill.
Be careful with taxi drivers they always are trying to charge you more!