I thought it was fairly settled science because petrol cars only use 30% of the energy generated by oil where as EV's are using 90%

Despite the major energy losses, a power plant is still more efficient than a car’s engine. Recall that an internal combustion engine loses around 80% of the energy that goes into it. A coal-burning power plant loses around 68% of its energy. Thus, an EV powered purely by coal still uses less energy than a car powered by gasoline.

https://thedriven.io/2024/01/31/electric-vehicles-use-half-the-energy-of-fossil-fuel-vehicles/

but as you said

But some electricity comes from wind

Yeah, even at our worst times overnight we're not a purely coal powered nation anymore

https://explore.openelectricity.org.au/energy/nem/?range=7d&interval=30m&view=discrete-time&group=Detailed

And we get cleaner every year:

https://www.aemo.com.au/Energy-systems/Electricity/National-Electricity-Market-NEM/Data-NEM/Data-Dashboard-NEM