I ate at Taco Cabana earlier this week. And I've come to the following conclusions:
1) Taco combos: If you're someone with even half a decent appetite, 2 is definitely not enough.
2) Unless you plan to eat through your chips right away, order guacamole with your chips instead of queso. Especially now that it's Fall, queso and tacos cool down too quickly. Which brings up...
3) The tacos are wrapped in foil for a good reason. Don't unwrap one unless you are ready to eat it immediately. Make repeat trips if you need your salsa or better yet, just put it in those mini-cups so you can eat your tacos while it's still warm.
4) One mini-cup is equivalent to a good amount of pico de gallo for one taco.