Not enough toe causes wear on inside of tires. They need to be slightly toe in. 0.15° is spec (aka 1/16" across the bump in the sidewall).
I hear all the time people want to have zero toe in. Zero toe will wear inside edge. Inside edge wear means not enough toe angle usually. Too much inward toe will chew up outside edge.
Reminds me of funny photo I took last night
"Outside rated" tire. Brwahhaahhaaa