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Unpatchable AMD Chip Flaw Unlocks Paid Tesla Feature Upgrades
(www.tomshardware.com)
This is a most excellent place for technology news and articles.
It's not just the mobile data that's spendy, it's the API calls to the vendor(s) they're getting that data from.
Android Auto/Car Play would be nice, but having used both, the native Tesla nav is better.