I say "tee alloys". Not the most common method as far as I can tell. (I also seem pronounce plenty of Pokémon in a unique manner compared to the general English-speaking populace)
Tee-eye is the most common. If I had to ballpark I'd say 95% of people I heard said Tee-Eye. I also heard people call it Tee-Alloys. Never heard Tye though. What sort of heresy is this.
both. Tye seems correct, but for some reason I just started saying Tee Eye. Maybe because of the calculators which were an extension of my hand through college?
I've always thought it was Tee Eye, like initials. I also only fairly recently learned that the MKV was not pronounced em kay vee, but rather Mark 5.