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Most, if not all car companies collect and profile your data, how can I improve my privacy when buying a modern car?
(www.mozillafoundation.org)
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Rule 2 of car ownership: never take it to the dealer for maintenance. Find a local shop and build a relationship with them.
Rule 1 is never buy a new car/buy a car from a branded dealer. Cars lose up to 30% of their value when first purchased. Several years ago I bought a 3 year old car for half it's new value - that's how much they depreciate (a Honda no less). Brand dealers are pros at screwing you over.