What's the mileage tax you mention?
https://www.caradvice.com.au/955801/victorias-ev-user-tax-is....
https://www.whichcar.com.au/car-news/victoria-passes-ev-tax-...
There's a $3k limited incentive that was used to distract from the fundamental issues behind taxing EV mileage. It doesn't cover long range cars as they're outside the price bracket.
The reasoning was that there's no fuel excise being collected, yet the fuel tax isn't being used to cover roads - normal tax payments are.
Also it doesn't care that ICEVs currently aren't paying for environmental emissions, when they should.
Actually having said all that I should just have pasted https://www.youtube.com/watch?v=fLflYkgnNBY , which explains it all so much better. (Fair warning: Australian language).
I find it more than a tad ironic that the NSW Liberal (conservative) state government has the best EV incentives while the Victorian Labor ("progressive") has the worst, out of our two most populous states.
[0] https://thedriven.io/2021/04/29/perrottet-flags-holistic-app...
[1] https://www.environment.nsw.gov.au/topics/climate-change/net...
https://streets.mn/2016/07/07/chart-of-the-day-vehicle-weigh...
(I _am_ paying on my ICEV, which I'm going to get carbon offsets for soon).