Little bit, yeah. If it gives you warm fuzzies to use the 0, and the engine seems to like it, go right ahead.
I've always used the Mobil 1 Extended Performance 5-30 in my Tacoma, or regular M1. Truck now has about 127K and doesn't use any significant amount of oil over 10K OCIs.
I considered trying Mobil 1 0w30. Even started a thread here about it. In the end I decided to just stick with what I've been using.
If I lived in upper Wisconsin, Minnesota or something like that, I might even use a 20 weight in the winter. Here in Tennessee it doesn't get cold enough to warrant it, IMHO.
It's in the single-digits here tonite, but that's about the coldest it ever gets, and we're having a pretty cold winter.