It took me a few tanks to get the calibration just right. Either way.... The tank data is king. That is your actual number regardless of what any instrumentation says which is why it is better to run a full tank. Also, make sure you know how far off your odometer is. My tires are tall so mine reads low. I've never seen one be correct. Once I multiply my odometer reading by the calculated constant I'm much happier.
P.S. Get a vacuum gauge for additional instant analog information. I use my vacuum gauge more than I look at MPGuino.
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