I would have preferred AM instead of WS - they provide a complimentary premium service for all international flights and include baggage fees even for economy.
I graduated in 2007 - and I don't recall seeing that gas station. From imagery it looks like it was taken down in 2002.
Image from 2001:
And then again from 2003:
I tried it a couple of times when they where on 17th and just recently went in again in their new location. All three times I was disappointed.
Unimarket just off Macleod trail has solid Mexican food for a bargain!
Neither are actually Mexican owned/rooted so sadly neither are authentic in any way. Moose and Poncho is the way to go in my honest opinion.
Don't waste your time going to Tropical or Anejo.