As JeoRav4_2008 and mikefocke have alluded to this issue has been around since at least 2019 with several threads and hundreds of posts hitting it from all angles. Car review sites refer to it as the RAV4's "drinking problem" meaning it won't drink enough gas.
The crux of the problem as I recall started when some engineer said the range would be nearly 600 miles, with 580 miles somehow being advertised as THE number, possibly to help sell Toyota Hybrids.
Simply "adjusting" that number to 500 would've avoided likely thousands of complaints and maybe nearly that many fuel tank and gauge replacements. If you could beat THAT number you'd feel great and pat yourself on the back. But with 580 there's definitely some problem for Toyota since it can't be my fault it didn't easily happen.
After discussing this ad nauseam previously with fuel tank diagrams, dire "overfilling" or running too low warnings, neither of which IMO are valid, it comes down to stretching both ends. That is by coaxing it to drink a little more after the first few click-offs and running miles past the low fuel light and DTE=0.
For instance, I filled my 2018 Accord Hybrid to about 4-6 click-offs and now almost 500 miles later its RANGE=28 miles. (I agree with RobertB, Range is better than DTE.) From previous testing I've gone 54.3 miles past RANGE=0 before running out (in my driveway, that was nice!) so I'll set an odometer when RANGE=0 and temp fate for 40 more miles or so.
So my advice is either get comfy with one or both of these two techniques or use 480, 500 or whatever works for you as THE number.
