Whoa, MedicalMan. Is that really true? It's been my experience that bars carry EITHER Mahour OR San Miguel and never both on tap because, I believe, of distribution licenses - much for the same reason that restaurants will carry EITHER Coca-Cola OR Pepsi but not both.
One of my favorite Madrid bars with a terraza and LOTS of space is the now famous (ahem...) El Brillante on the Glorieta de Carlos V (a.k.a. Glorieta de Atocha - across from the Atocha train station). They unfortunately ONLY have San Miguel on draft for cañas/jarras and NOT Mahou - but I think you can get Mahou in the bottle.
I think all the Museo de Jamon places carry Mahou on draft but not San Miguel and most of the smaller neighborhood bars carry Mahou on draft it seems.
Keep in mind that, in general, Spaniards are not beer-brand-loyal. Maybe it's because whatever they happen to get on draft (or is that "on draught"?) is going to be goooooood whether it's Mahou, San Miguel, Cruz Campo (in Andalucía), or Estrella de Galicia. I've YET to meet a Spanish beer I didn't like. heheheheh... :p Mmmmm...
Sal.. <hic!> ..udos, MadridMan
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