I reset my "Trip A" odometer every fill up. I can't actually remember when I last filled up but this was my result from 1 tank filling up today, 2 Jan, 20.. Includes a road trip to the mountains. 9.2 gallons to fill.Know this isn't a record, but post your fill ups too.
The Prius Prime is a plug-in hybrid, of course, but I think, more than a plug-in hybrid, the Prime was designed first and foremost to be just a super-efficient car, both on gas and on electric.
From what I saw on the fuel efficiency web site, the Prime in EV mode is the most efficient 50 state EV. Also in Hybrid mode, the most efficient 50 state in using gas.. There was one tank where I got over 1,900 miles in my 2013 PiP. It's too soon to tell on my 2020 Prime.
Since EV mode cost more than HV mode in our area, I do quite a bit of HV mode drives mixed with EV mode. My daily commute is longer than the EV range but during summer times without doing longer trips on weekends, I have reached 1762 miles before the fill up once. But my distance between the fill-ups are usually much shorter than that.