We have a 2021 RAV4 XLE and
We have a 2021 RAV4 XLE and have been frustrated that the low fuel indicator light comes on much sooner than we anticipated it would, and if we fill up when the DTE computer says 25 miles, the tank accepts only ~10.5 gallons to fill.
I conducted a bit of an experiment which bears out what Steven reported above about the "reserve" tanks. Decided to keep driving past the DTE 0 indication (dash gives a "Refuel" message instead of numbers). The car traveled an additional 80 miles (after DTE=0) before we filled it up. I wanted to keep driving, but the wife insisted we fill it up. The car accepted 13.5 gallons, which tells me we had another gallon to go, or between 30-40 miles farther we could have travelled. Incidentlaly, after filling up the tank completely, the dash computer told me we had a DTE of 370!!! I know we get far more than that and am disappointed by this inconsistency.
In all, I've also been disappointed with the overall mpg. We are getting only ~33 mpg driving in a Boston winter -- splitting about 1/2 our miles on highways and surface streets. I'm not new to driving hybrids, as we've had a Prius for 15 years. I thought I'd be getting closer to the advertised 40 mpg.