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elm
I have an OBDII elm unit permanently mounted in each of out cars. They naturally were in the way so I relocated the OBDII plug so it is loose behind the driver side kick plate and I can snatch the unit out when I need to test / read codes on someone else's car.
The units are only 12 bucks on Ebay (free ship)
Torque sells a widget app that I have set so all I do is toggle it on or off and have the ave/mpg, mpg, coolant temp and rpm set on one of my screens.
The only down side is that I have to fire up Torque and set to a different car profile to work when I switch vehicles.
However if I drive the same car all the time I only have to toggle the widgets on to use.
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