I did some rough math for Europe, assuming 1.43 EUR / L (current price in Slovenia), and 7L / 100km (an IMO sensible ballpark for "mixed" driving in a modern-is

I did some rough math for Europe, assuming 1.43 EUR / L (current price in Slovenia), and 7L / 100km (an IMO sensible ballpark for "mixed" driving in a modern-ish car). Turns out that makes for almost exactly 10EUR / 100km (=0.1 EUR / km), or 10km / EUR. I used a ballpark of 30000 EUR of a difference (which is also very close to the current exchange rate!), and the result: 300 000 km. Note that this doesn't mean that you have to drive for at least 300 000km, because electricity isn't necessarily free. Therefore, the number is likely to be higher. Also, realistically, one will likely need at least 1 battery replacement (~6000 EUR, as far as I'm aware) during this time. THAT SAID, as fuel prices go up, the required "break-even" distance is going to decrease, as `km / EUR` you get with fossil fuels decreases.