Unless you have a tail wind, the Inspire 1 will NOT fly 65 mph. I was able to hit 65 mph in ATTI mode with an 18 mph tail wind. I was running FW version 1.08.xx and still run that version to this day. I don't know who told you that the Inspire 1 flies 65 mph. Unless you modify the FW (which IS possible), she basically flies about 45 mph (in ATTI mode).
It is my understanding that the earlier versions of the I1 would get into the 60's. Then DJI detuned them with FW. I have communicated with someone that can do it with a mod, but he is being a little slow, so I am exploring other options. But it can be done!! I'm getting 42 now in P mode. Bolton