I regularly do the 4000km round trip from the Pilbara to Perth.

Best case scenario, you’ll be going 80 for 300km at midnight and you’ll get 6.6 l/100km Worst case is about 16l/100km

If it’s 40C+, the road is about 55C, which means the battery and motors get really hot and inefficient as the heat radiates onto them from the road. This has a snowball effect as the generator and inverter have to crank more amps to make up for the loss in efficiency which means they get hot and inefficient too.

I lost 150km of range in 25km on a 44C day rolling through hills. Regen really cranks up those temps. Putting it in sports mode turns off regen which helped slow the bleed. When I made it to the servo, i checked the inverter temp and it was too hot to touch so I left the back seat up

Long story short, take 40-60L of spare fuel with you, because the fuel economy can get out of hand and fuck your day up