This many trips this long, it's probably not that much cheaper to rent, add in the pain of renting and I would do the same as GP.

But then why would you pay more for electric car and still need to rent? It doesn't make any sense as a purchase at that point.

Electric cars never made sense strictly from a financial point of view. They've always been much more expensive than their ICE counter parts.

Why?

The vehicle is mine, I make sure its maintained properly, has correct tires, I make sure its got what I need. I have access to it even when the local rental company has only Nissan hatches. The diesel costs me maybe 15% more than the petrol for my old honda hatch. Its also more comfortable, safer (for me) and a more enjoyable ride.