12. The Automatic ($80) saves you money on gas by teaching you how to be a better driver.
The Automatic adapter plugs into a vehicle’s standard diagnostics port (lol, did you even know that existed?) and pairs with a smartphone app that shows information like why the check engine light is on, feedback on how you can drive more efficiently, and – most amazingly – where you parked your car!
Automatic actually works with most cars 1996 or newer
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