My 2021 GLS 450 frequently displays unreasonably low driving ranges when I use it for in-city errands. The reason for this is the onboard computer extrapolates range from your typical driving pattern and fuel consumption. If you take a long highway trip right now, the mileage range will adjust as your fuel consumption improves to reflect new data. When I have a period of inefficient driving my range is < 300 miles.
Similarly, I've never reset the mpg statistics on my 2024 LX600 and have averaged 18.5 MPGs over the last 1,000 miles. The range showed 24 miles (with the actual fuel gauge near empty) and I filled the tank with only 16.4 gallons of gas. That's about 4.5 gallons less than the reported tank size. Is this common?