I remember reading here on TMC a while ago about some problems some Hawaiians were having. Similar situation to yours: speed limit data not available (if I recall correctly) so car defaults to 30 mph or something totally inappropriate. Meant that they basically couldn't use AutoPilot on that bit of road because they couldn't manually over-ride the (wrong, & too-low) default by a large enough margin.
No solution at the time other than to try to have the road data updated... Hope things have changed somehow since then; there's a new 40km/h zone near me and car always wants to do 60 (yeah different problem but still related).
On a positive note, I parked the Model 3 in my garage early on Saturday morning at 69%, and on Sunday afternoon when we got home, it was still on 69%. I refrained from opening the App while away, and don't have Sentry enabled. I notice that the Tesla widget (iPhone) doesn't wake the car if it's asleep, whereas opening the App appears to do so. Is that correct? Very useful, as I can look at the widget and it won't bother the car if it's asleep, but if my wife's on the way home (i.e. driving), then the widget
does update and I can e.g. start making dinner.
Been taking neighbours for drives. Everyone has been really interested. They're impressed by the (SR+) acceleration and the young kids love the farts - much to the chagrin of my wife who doesn't like me showing them that 'feature' (while they're laughing hysterically).
Really enjoying this thing, in case that wasn't clear.