Has anyone heard that putting heet in your gas tank can help you pass emissions or is it even safe to add that to a rotary?

 

Its just drygas. Gas already has enough crap in it. Don't waste your money on bottles of methanol/ethanol/...... The iso-heet can be added if fuel freezing is an issue where you live. It won't do anything else.

Emissions will pass if your components are working. Nothing in a bottle will fix a bad o2 sensor, a clogged cat, a failed smog pump,..............