Hey Tony K here's your answer (if you haven't found it, I just read some of your posts )
If you mix the 2 (let's say 50/50 or whatever) then your ac will work for a short time, and then you will burn your compressor up. But MOST people don't do this, including myself so I don't have any HANDS ON experience because I have common sense. Oh...and compressors are generally expensive. Cheerio