Things change all the time for the delta between gas and electric prices.
In California Electricity got more expensive for a while because of the political and environmental pressures to go away from coal, natural gas, hydroelectric and nuclear. When they regulated more renewable power, it came at a higher price. When the price of Natural Gas dropped due to oversupply, the electric bills went down as well.
Then the gas tax was increased to pay for a high speed train in our desert to link cities. Now it is over $4.00/gallon.
With each new policy change the energy costs can go up or down. For now a Tesla running on Solar is the best deal, but even at Superchargers or at home the costs are much less than for gas.
Every state has their own policies, and most of the time an EV will cost much less to overall operate than a gasser.
As in most things, there will always be edge cases where a gasser may be cheaper to operate, but for the most part that is an anomaly.
In California buyers of EVs get $2,500 back from the state in a check, as well as many utilities rebate $550-$1,000 to their customers for going EV. Can also get $500 back for installing a EV plug in your garage.
Some get free Supercharging for life, some get 5,000 miles worth for free, or for a year. Seems like the Tesla free electricity changes as fast as the prices at the pump.
As I said, it gets complicated.
Everybody needs to be smart about it and source out the least expensive place to charge up. We have a local park near here that provides 30 minutes of free charging. You can un plug and get another 30 minutes on and on. Some can charge at work. some will eat at a place or stay at a motel which offeres free destination charging. The most expensive charging option around here is using the 3rd party independant chargers. They cost much more than charging at home or any Supercharger.