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Old 11-17-2013, 01:29 PM   #8 (permalink)
twinair
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Not sure about the Iphone, but I've been using this bluetooth odb reader and the Torque app on my android phone (but my car already does show mpg, so I primarily used it to watch intake/boost pressure):
Amazon.com: Super Mini ELM327 V1.5 OBD2 OBD-II Bluetooth CAN-BUS Auto Diagnostic Tool for Windows XP, Vista, Win7, OSX and Android: Car Electronics
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