I bought a used 2016 VW eGolf as my first experiment with owning electric cars. I wanted to experience everything about owning, using, driving, and running an EV before I took on the Rivian because of exactly what you're researching. Until recently I had a variety of ICE cars and had instincts about range, fuel economy and how all the factors played into why they changed.That's such an important point! I found that a lot of my interviewees didn't understand the metrics in their EVs and how power was being consumed. Further, I think there' is a correlation between an individuals' understanding of energy metrics and range anxiety. I really want to dig further into this topic as well!
Back to your point about adding a monetary value to energy consumption in a vehicle. I feel that this could be a data collaboration opportunity for automotive and charging station manufacturers.
I live in a northern climate (Minnesota) and knew that cold can impact an elections cars range, but I've been surprised just how much temperature fluctuations have changed my range. I've also been surprised how directly running the AC or heater or electric seats has an impact. I always knew running the AC in my ICE car would impact mileage, but seeing it play out with my EV has caused me range anxiety.
I'm open to talking more about my experiences. I bought this short range EV just to find out answers to what you're researching.