New owner - question about mpg averages

I've searched the manual, and it isn't perfectly clear on the specifics, especially for the ODO mpg display. It says:
"While the odometer is being displayed, or when the odometer/trip meter are not being displayed, the average fuel consumption from the last reset will be displayed.
While the trip meter is being displayed, the average fuel consumption will be displayed in accordance with the trip meter distance from the last reset.
The function can be reset by pressing the TRIP button for longer than 1 second when the average fuel consumption is displayed on the trip
meter.
Use the displayed average fuel consumption as a reference."
So, this makes it clear the ODO mpg isn't a lifetime average for the car, but what does "reset" mean in this case? For the trips, it means reset of the trip odometer. Apparently, from what I've observed, the ODO mpg resets when the car is turned off. I'll have to see if holding the trip button with the ODO displayed can also reset the ODO mpg, or if that only holds for the Trip 1 and Trip 2 meters.

 

My point was the instructions weren't clear to someone who hadn't already figured it out. I figured it out for myself after making a point to compare/test the possibilities. The meaning of "reset" in the instructions differentiating the trip and ODO mpg meters was only explained for resetting the trip buttons. This left me wondering what the other reset referred to. Conceivably, reset could mean pressing a button to reset it manually, restarting the car (note that "restart" and "since start" are the terms used elsewhere in the manual, not reset), resetting the history in the Eco app, etc. So, sure, it's clear once you've figured it out for yourself by some trial and error, but I wanted to highlight the possible confusion for other new Prius owners. Had the instructions said restart, or even better, since hybrid system start, then I'd call the instructions "pretty clear".

 

I'm also going to use Fuelly. I actually went and topped off the tank last night just so I could enter it as my first fill-up and get a Fuelly history started. So, in 400 or so miles I'll get my first "real" mpg feedback. As is, if I'm remembering the starting odo correctly from when I drove it off the dealer lot last Friday, I averaged about 43.5mpg over the first 3 gallons. Not bad, considering it includes my first baby steps learning how to drive the Prius like a Prius + whatever the service guys did testing it before/after the sway bar fix (story in another thread). As for the multiple mpg displays, now that I understand that the ODO mpg is just tracking your mpg for the current trip, I'm using that for on-the-fly feedback about how I'm doing from day to day. I was excited to pass 50 for the first time yesterday after getting it back from service, and then I hit 56 in the evening.