So my Renault Megane E-tech consumes around 18kWh / 100km during the summer. The previous generation Renault Megane with a petrol engine consumes[1][2] around 7L / 100km.
Prices fluctuates but it's been roughly steady at around 6 NOK / kWh using a supercharger[3] and 21 NOK / L at the pumps.
So to drive 100km it would cost me about 108 NOK for my EV, or 147 NOK if I had the petrol car.
Now, this changes dramatically if you can charge at home. Even during winter with high prices you'll typically not pay more than 3 NOK / kWh and typically around 1 NOK / kWh, so a fraction of the price for petrol.
edit: I should note that coops and similar can get up to 30% in subsidies from the gov't to install chargers in the common parking areas[5], so not just single home owners that can enjoy charging at home.
[1]: https://www.auto-data.net/en/renault-megane-iv-phase-ii-2020...
[2]: https://www.automobile-catalog.com/make/renault/megane_4gen/...
[3]: https://elbil.no/dette-koster-hurtiglading/
[4]: https://no.globalpetrolprices.com/Norway/gasoline_prices/
[5]: https://www.klimaoslo.no/tilskudd/ladeinfrastruktur-til-bore...