Driving 120km/h on the highway, upwind, uphill, airco usage all decrease your battery more than driving in ideal conditions.

The WLTP is a scam number because ( the way I see it ) it's how far your car can drive on a perfectly straight piece of road with a slight breeze from behind in the perfect temperature. Conditions which are never met in real life.

In my old diesel car the usage between 120 and 90 km/h on a highway was neglectable. It's the difference between 5.5/100km and 5.7l/100km.

Driving 90km/h on a highway vs 120 will probably easily make 100km range difference in a Tesla...

There's a button on the Tesla where you fan see the estimated range based on your current power usage as well as what you're losing power too ( acceleration/wind/uphill/... ).

I'm not defending it. It's just not as straightforward because it depends on more than your petrol car.

Tesla model 3 long-range has a WLTP of ~600km. I think the furthest I'd give it is 450-500 in summer and ~ 400-450 in winter ( on a 100% charge). Normally you'd only charge it to 90% to increase battery lifetime unless you're going on long trips.

Not to mention the power your car loses just standing on your porch...