Tyrion shows up with a 1+ save in Army Builder. The GW FAQ for High Elves, located at http://www.games-workshop.com/MEDIA_CustomProductCatalog/m1540038_High_Elves_FAQ_2008-05_Edition.pdf
says the following:
Q. Does Tyrion have a 1+ or 0+ armor save?
A. 0+. He does not count Malhandir's barding...but he is still mounted (and thus entitled to a +1 armour save bonus). The Dragon Armour of Aenarion grants him a 1+ armor save, but it doesn't say it cannot be modified further.
says the following:
Q. Does Tyrion have a 1+ or 0+ armor save?
A. 0+. He does not count Malhandir's barding...but he is still mounted (and thus entitled to a +1 armour save bonus). The Dragon Armour of Aenarion grants him a 1+ armor save, but it doesn't say it cannot be modified further.