Which ATF do I use?

[bondojamesbondo]

My manual says “use only t-iv” but one post I read here said that t-iv wasn’t a thing when my car was being built, that an 05 should use dex iii, but I would assume I should go by my manual, right?

T-IV fluid was introduced by Toyota in 1998, so it was definitely a thing when the Aveo was produced. You can find Idemitsu T-IV at Advance Auto Parts; that's your best bet instead of using some "fits-all" stuff.