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CaroO shows me my instantaneous miles per gallon and has a screen of detailed information, but I really just use it for the dash cam feature, and Black Box for Torque does not do a good job of that. Unfortunately, I have some problem with my OBD-II reader, which was one of the more expensive ones, costing sixty-five dollars. Sometimes it seems to work fine, on other occasions my phone says that it cannot connect, but my adapter is flashing lights like normal. Then there are the times that the dongle just has one red LED. Sometimes adjusting it helps. On other occasions, I need to unplug it and put it back in. I bought the cheapest dongle, but could not even get it to connect to my phone.
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