Answering my own question, there’s the mpge, miles per gallon electric equivalent. They take one gallon of gasoline as 33.7 kilowatt hours. Typical numbers seem to be 120 to 140 mpge.
Around here, a winter kwh is about eight cents. Summer, about 12.
So gasoline gallons are currently around the same price as electric equivalent gallons if they aren’t lying.
But before recent gas prices, gasoline was cheaper per watt hour, but gas cars don’t give 120-140 mpg.
So as long as you can charge a car on 8-12 cent electricity, your fuel cost is lower for an electric.
Higher usage will even it all out. It will be too bad if electric cars drive up electric rates in general.
I’m never going to be interested for several reasons. In fact I’m starting to want a car that can burn waste cooking oil among other things.
In California where the legislature is pushing EV’s, the current SoCal Edison time-of-usage electric rates are $.17 kwh except for peak usage time roughly 3 to 9 pm, when the rate jumps to $.34 kwh. And that only applies if your neighborhood is not experiencing a brownout, or blackout due to demand exceeding electrical supply. If that happens you may have to walk to work, even further reducing your transportation costs. So, you plug in your car when you arrive home at 6 pm, your kwh usage to charge a near fully discharged battery would be 40 kwh. So, the first three hours at 3 kwh per hour would cost 3 hrs x 3 kwh x $.34 per kwh or $3.42 for the first three hours, The remaining 31 kwh would be 31 kwh x $.17 kwh or an additional $5.41 or $8.69 for the overnight charge, assuming you depleted most of the charge with your commute. And the quoted rate is for the 1st tier. If your charging demand takes you into the 2nd or 3rd tier, the cost would be even higher. I’ll leave it to someone else to factor in the initial cost of the EV, and the cost to replace the battery.