I see you also are from Texas. So........
I have one car with Freeze-12 {wagon} and one car with R-12 {240}
Currently, they both get down to the 40-41 degree point, which is great!
However, last summer, when the temp is over 95 degrees, which it is
every day during the summer, I couldn't get vent temps much below 50 degrees with the Freeze-12. I didn't have the 240 last summer, so I will know more about that in a few months.....
I don't notice much difference between Freeze-12 and R-134A. High side pressure wasn't much different, and it is in the mid 200's, even creeping higher when temps above 100 degrees!!
And, BTW, if you would use the search function, there is enough info to be reading for 2-3 days solid. Take it all in, then you decide...
