Hum.... why do you want to mix these? In *THEORY* I would think they would be ok.. they are slightly different chemistries... but only slightly. They are both HOAT, but G-05 uses silicates and no phosphates, while ZAV uses phosphates and no silicates. But Zerex G-05 is low silicate anyway, and phosphates shouldn't be a problem. They are just one of many different corrosion inhibitors which are generally compatible with each other.... so.... i guess...yes*? I have a mercury milan that takes G-05 and 2 Lexus vehicles that I use ZAV, never really needed to mix them. Used both for years and years.
*Disclaimer: I have no idea. Anything posted by this tinmanSC guy is probably not only wrong, but may cause the universe to implode. Double check everything he types before implementation of this "information"... if you can even call it that.