Yes, a few times now. Fill up outskirts of Melbourne (i.e. Shell Donnybrook) with V-Power or equivalent and aim to fill a near-empty tank if you usually don't use 98 octane (I don't) so you've got that little bit more energy in the tank. It takes smooth driving (but not slow - I'll typically drive at the posted limit within tolerances); not accelerating hard helps a lot. I've made it fairly comfortably to Liverpool in Sydney suburbs with 15km showing on the DTE display in a 2001 V6 Commodore a couple of times. Turned the air-con off about 80k out of Sydney because it was looking dicey for a while. Most recently I made it to Allambie heights (so across the harbour and spit bridge) with 3km range on the DTE in the RX450h. That was very interesting; smooth traffic through to the harbour tunnel, but bad traffic from there; suddenly the DTE dropped from 30km to 15km, and I had 11km to my brother-in-law's house, and another 2km to a servo after dropping the family off. Brother in law's house up a hill, so chewed through the juice and the battery getting there, but coasted back down and charged the battery on the way to the servo; DTE was showing 5km when I pulled up at the pump. Pumped 63 litres (capacity 65, had filled it to the brim in Donnybrook), so 7.44l/100km achieved over 848 kms between fills. Any significant headwind or bad traffic on the highway (i.e. stop start for road works) would have made it impossible.
