Sitting here in my Lazyboy simulating driving South on an Interstate.
I put in a new destination (to the North)which made vehicle head off an exit to go back the other way. On what looked like an on-ramp, there was no specified speedlimit. My vehicle sped up to over 80 mph.
Well, a simulation is just that... can't be trusted.
My Nuvi 855 has crazy speeds in simulation mode. The speeds are always faster than actual posted speed limits for the paticular road.
I suppose the speed up anomaly is a plus, otherwise you'll get real time simulation of a trip from, let's say Miami Florida to Atlanta Georgia that would take over 10 hours to simulate.
Garmin nuvi's (at least the older ones) have been shown to learn over time the average speed you drive on the various road types and adjust simulation speeds and ETA to destination based on your driving habits. So this may explain in part what you have observed. It is explained in more detail in this article: http://www.gpsreview.net/train-your-nuvi-eta/.
You can easily demonstrate this phenomenon if you have been using your nuvi for some time since the last hard reset. Set up a simulation and carefully note the simulated speeds on various roads and the total time to destination. Then do a hard reset of the nuvi. Immediately after reset, repeat the same simulation and you will likely see some different speeds and a different time to destination.
However I would not recommend this as your GPS would have to re-learn your speeds. I wouldn't be too happy with the re-learn process as my ETAs would be inaccurate during this time. I rely on my ETA for work, and would not want to be late for any meetings.
I'll rely on others to provide feedback on the above test and take their word on it
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