Here's my savings using PG&E's EV Rate Plan (which is 9 cents when charging at night) and a $3.75 gas price.
Here's the same, except I made the electricity cost 0 cents, because if I got an EV, there's no way I'm using utility power for my EV!
That's an 11 year payback! If I got an EV, I'd be praying that gas prices go up so my payback goes down!