I have a 2019 RX450h which has the same size fuel tank. I don't routinely do this, but there was one occasion in the Scottish Highlands when I drove about 40 miles beyond the point at which the on board computer said there was 0 left, and when I finally stopped to brim the tank I managed to put in just over 60 litres. But this would mean there was still over a gallon (in old money) left, good for another 35-40ish miles based on my average fuel consumption.