Beat me to it. Exactly. Like you, we only reset the trip odometers, not this one.I would recommend not resetting this after the initial few tanks of gas.
This average can be used to compare the number from your tip meter mpg calculations. If you notice the you are getting a couple lower than average number after a couple tanks it could be an indication that you vehicle needs to be serviced. If your lifetime average keeps being reset you will not have this info unless you track on paper.
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