Ok I'll be brief as I didn't do extensive documentation of the trip and can't do an awesome detailed writeup like gizmonty's.
A lot of effort went in to the planning of the trip (which was kinda fun) because I knew it was going to be tight. The final decision to drive up the back way via Omeo only arose once I had the very generous offer from Nick in Bairnsdale to charge at his place on the way. The advantage of this route was that even though it was longer I had no particular time pressure and could potentially drive all the way up to the lodge (weather permitting). The alternative of going via Bright would have meant leaving the car in Harrietville and having to make a bus schedule (no way I was putting chains on and driving up the Hotham road).
EVTP was estimating 277 RKM, 48.1 kWh, 175 Wh/km from Melbourne to Bairnsdale (281 actual km, hmm). The car itself told me I could make it about 40km past Bairnsdale (by trial and error of destinations as it would always route me to the Richmond superchargers first).
Both turned out to be pretty optimistic. After charging to 100% and an initial indicated 10% remaining at destination, almost immediately after we set out we got the 'drive slowly to reach your destination' and the estimate dropped to about 7%. It then proceeded to fluctuate up and down (mostly down!) so we kept strictly to the speed limit until we reached the 110kmh sections where we stayed at 100kmh to hopefully gain some range margin. Things climbed back up a little and even reached 10% again briefly. Nonetheless we rolled in to Bairnsdale with a cool 3% remaining (this dropped a lot right near the end so may have been inaccurate). Greater than 0 though so I was happy
Actual indicated usage was 54.7 kWh, 189 Wh/km, almost 7kWh more than EVTP's estimate despite not going at the full speed limit for some of the way.
After a very loooong 6 hours in Bairnsdale having brunch, coffee, a wander, more coffee, afternoon tea, more wandering, coffee, and some wine and cheese (Bairnsdale luckily does have a few nice places!) we headed off up to Dinner Plain.
As I'd fully charged just to be sure, I wasn't particularly careful from Bairnsdale to Omeo, and the road gave me a chance to have a bit of fun with the car for the first time. It handled things very nicely and the auto high-beam was great for letting you concentrate on keeping on the windy road. Once past Omeo we settled back down to conservative driving, as the real power-sapping climb starts from there and the possibility of icy road conditions becomes an issue.
The road was clear all the way up (we knew) but I was actually slightly disappointed I wouldn't get a chance to try it on a bit of snow, after having watched every video I could find about how well the RWD Model S handles snow (about as well as most normal AWDs, apparently).
So we arrived uneventfully at the door of the lodge, passed the UMC cable through a bathroom window and the car sat there happily charging the next 3 days whilst I proceeded to dislocate my shoulder 15 minutes in to the first morning.
Total usage Bairnsdale to Omeo: 45.7kWh, 274 Wh/km over 164km (cf EVTP estimate of 36.9 kWh, but I didn't try to conserve power a lot).
The trip home started very easily, all downhill
Didn't bother to take note of what we used unfortunately, as I knew it wasn't an issue and we'd have to fully charge in Bairnsdale to get home anyway.
After a somewhat shorter cycle of eating and drinking whilst charging we headed for Melbourne with an initial indication of 15% remaining at destination. This seemed highly improbable given the 3% we'd arrived with from the other direction, and we were now heading in to any prevailing winds.
Sure enough within minutes this dropped to 10%, then 5% and then about 50km in we got this:
Not particularly concerned at this point as I knew we had options like Chadstone if we really fell short, so just dropped our speed by 5kmh and kept going, watching the estimate at destination slowly creep back up until we arrived at Richmond with a good 7-8% left. Easy!
So that was about it. Not so brief in the end but two final interesting things to note. Firstly driving at 95kmh on 100kmh stretches and 100 on 110s we expected to be passed by everything on the road. Not so, the vast majority of people were more than happy to sit behind us and cruise. Secondly, despite the reduced speed our ETA at destination (and actual arrival time) pushed out from what was indicated at the start by a whole 5 minutes. Over 3 hours.
And it was the most relaxing long distance driving I can recall ever doing.
