David:
I'm not sure what you are trying to accomplish, but I hope this may help. If you are reading the "instant mpg", which changes VERY frequently as you drive, it is "resetting" constantly. If you are reading the "average mpg", which changes MUCH more infrequently, then please understand that it is simply displaying the average of the most recent "instant" calculations and therefore is really resetting itself also, just less frequently.
It is NOT displaying your average mpg for all miles driven. I'm not certain how many of the instant calculations are included in the calculation of the average, but I think it is either the last 50 or the last 100 "instant" readings.
Your idea of disconnecting the battery may work to cause a "reset" but I don't think that it will begin a new "lasting" period of time over which you can compare averages. I believe what we have displayed is a "moving average".
Merry Christmas!
Ed
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2016 EC Aspire 42RBQ / 2014 CR-V
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