They sure can be moving targets. Electric rates have stayed steady for me for the past decade (most of my local power comes from nuclear and hydro), so those are easier to predict, but gas goes up and down a lot. I'd say Gas can't get any cheaper than it is now, and it's unlikely to go more expensive than 1.50$ more from what we're currently paying (as this will prompt more drilling in the US). But what do I really know? Oil predictions got hard once covid hit.... I will say, even with my math, I figured the payback time was close enough to breaking even with how long I typically own cars for (6-8 years), and I want the prime for the faster acceleration and the idea of driving on full electric more often. Tesla's cost wayyyy too much, and I honestly don't think they're even that nice, so that's why I'm here! hahThe thing is both gas and electricity are a moving target.
And both are quite high in California .
Its about 3 dollars for gas now never went down that much but was
up to 4.5 at its worst . I can imagine it going through that again.
Watts per mile is starting to be a common measurement for electric cars.
There may be more factors to owning a vehicle than it's bottom line
cost like what you can carry or haul with it.