But back on topic...
The bolt dropped in price $6,000 in less than a year. The Sonic I'm betting will never get any cheaper. All the money in electrics are in the batteries and high efficiency motors, but there's very little maintenance. I drive a 2016 Camry for my DD, I paid about $21K for it new. The same size car, be it a Tesla or other, would probably cost low $30's. Even with a moderate amount of driving it would take a long time to get back that extra $10K even over 5-7 years.
I was commuting about 40-50 miles per day in the Camry at about 30 MPG.
40 mpd x 30 days is about 1,200 miles in a month.
1200 / 30 mpg = 40 gallons of fuel per month. Average cost probably around $2.30 per gallon is $92 per month in fuel. Throw in oil changes, air filters, misc odds and ends related to a combustion engine and I'd estimate I'm spending $110-120 per month to keep the vehicle on the road, not including major repairs.
For the EV of the same size calculate 3.5 miles per kWh, or 28.5 kWh per 100 miles.
1200 miles per month / 3.5 kWh is about 342 kWh.
342 kWh * $0.12 is about $41.0 per month in energy costs. No extra oil or filters. Not sure what hidden costs there are, but solid state stuff > mechanical stuff.
So about half the cost in fuel, plus no oil changes or filter changes. I've heard that since EV's are a bit heavier than ICE cars they wear out tires faster, but the regenerative braking means rarely replacing brakes/pads.