I use the ELM 327 bluetooth adapter that plugs into the obd port, I personally use Dash Command on Android phone to connect to it and a lot of people use the Torque app.
Adapters can be had for as cheap as $10USD or a better quality one for $25-30USD, I have the better one after going through 3 cheap ones!
Unfortunately I have no experience with the Iphone connectivity but have heard it uses a Wifi adapter of the same type instead of bluetooth
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Staying Focus'd on MPG
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