Scangauge came in! Questions about DFCO, neutral and throttle control

[FLAteam]

I just got my Scangauge! I'm also driving a different car now, and I tried the Scangauge on it last night.

I've heard that when you're coasting and the MPG reads 9999, that means you're in DFCO (deceleration fuel cut-off). I found that this actually occured when the car was coasting in gear and also when coasting in neutral. Is this normal? I should probably do a bit more experimentation.

I also did a quick read-through of the user's manual and it looks like you can actually adjust the throttle position in which the fuel cutoff occurs. Is this true? If so, that's insane! It was at "24" and I raised it to "28", but is this really what it does?

Thanks!