I've been using fill-ups to gauge mpg's. That's been doing fine for me for a while. I'd like to get one of those obd2 transmitters, but I'm not sure if my car will transmit much useful info over it. I haven't had a check engine light even with some major problems with my car, so I can only assume that the obd2 system isn't working as it should...
In any case, I won't know until I try.
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