I've had a max speed of 66.1 in my flight logs for around 2 weeks now. I just synced them (10 min ago) and now it's telling me my max speed was 45.0. What's with the change? Not that it matters much, but it is cool to show others how fast this thing will go.

Could you please provide me with your DJI account email?
Is the email address the same as your forum email? I'll help to check it.

Android DJIGo4 has for long while had a bug where it was reporting MPH as feet per second (FPS).  This was finally fixed a few days ago with the update to v 4.0.3. So now you are seeing your correct maximum speed instead of your eye pleasing equivelant in FPS.

45 mph in FPS

Ok, Thanks.