As far as I know it's around like 500–550 miles on a full tank in the RX350h when cruising mostly highway in Eco mode. At least that's what I know. It's usually pretty true to the gauge, maybe runs a bit low if you're in Sport or heavy traffic.I'm curious about the cruising range of this one because I feel like there's a discrepancy between the claimed vs. the gauge on full tank. If anyone has any info on this, feel free to jump in. TIA.