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Do keep in mind that in Europe there are often required checks whether a car is 'roadworthy', in Norway this seems to be a biannual check: so you cannot really skip maintenance to the extent that that would be a huge factor.

You may be able to get more granularity by decoupling Google TV volume from the TV's own volume. To do this, you need to disable HDMI CEC control over volume in the remote's settings.

An hypothesis has to be falsifiable though.

For those taking this route: do note that the map data is downloaded from their servers. So don't forget to make a small donation to offset the server costs if you are able to!