I burned car gas for years and never really had much problem. In fact, I used it in an o-235 and it ran better since my lead fouling problems went away. You do have to be aware of the possibility of vapor lock in some cases and need to address that. As far as odor is concerned, i noticed that some Mogas smells worse than others so you can minimize or eliminate that problem by trying different brands. I used to like Amoco, but it's not available here...Diamond Shamrock seems to have a lower stink factor than others. For higher compression engines, I just use 100LL.