The z1 is telling me it's going to take 2 hours to get to a place that is 1hr away. It is usually off pretty bad, I've adjusted the regional settings to bump the speed limits but what speed limits work for most of you? I usually drive around 60mph and my readings are way off, especially in town readings.

the challenge I find is some of the regional roads that are almost highways but not quite.

Is it updating your ETA as you are en route?