Where I live in southeast PA with PECo as my electric utility I pay $0.18 per KWh. With my humble Ford C-Max Energi EV driving comes in at about $0.0525/mile. It's not possible to do that on gasoline.
This is really making me wonder, you are right. There's no way to get a gas vehicle to 5 cents per mile for the gasoline.
Here in PA, we choose our electric provider. These are exact numbers from my PECO bill:
Monthly charge $10.52.
Distribution charges $0.07813/kWh
Distribution System Improvement $0.19
Electric Supply $0.059/KWH
Sales tax adjustment -$0.03
This means I'm at 13.713 cents per kWh, plus $10.52 plus 19 cents minus 3 cents, per month.
The supply rate is determined from shopping around.
During the pandemic, I saw something not seen in a decade. The incumbent was cheaper than all the energy brokers. So, I switched to PECO. When I decided to check June this year , I was horrified. PECO was almost 12 cents, when old rates were available such as 5.9 cents no early term fee 12 month agreement.
I'm thinking if I had an EV charging at home, I would be on pins and needles with the utility games. Because I went over 2 weeks in June paying that high rate and running the central air--they used to switch fast, but it took over 2 weeks. In my case I wasted $25--what if I had an EV....
So let's say you're paying 4 cents more per kWh (I'm in SE PA too)--what would you save by dropping your rate by 4 cents?