The cost is of course directly tied to electric rates and if charging is done at home or at public chargers.
In my case I charge almost exclusively at home, although this month my son has taken the Chevy Bolt EV to college and has had to rely on public charging. The June cost increase includes his public charging costs.
View attachment 678500
In March we got our second EV and my wife and I went exclusively electric. You can also see in the chart how the summer electric rates kicked in during May causing the cost per mile to rise. During summer rate months we pay roughly 4 cents a mile and during winter rate months we pay roughly 2 cents a mile.
The car I most recently replaced averaged 25 MPG. Gas would need to be $1 a gallon to equal my summer costs, 50 cents a gallon to equal my winter costs.
The cost savings are reduced when comparing home charging (where the majority of charging typically occurs) to public charging (typically reserved for road trips, though those without convenient home or work charging rely on public charging).
My son charged at a public AC level 2 charging station on campus. It cost $4.94 and delivered 22.05 kWh. That same 22.05 kWh would have cost $2.60 at home. That 22.05 kWh is very conservatively about 75 miles worth of energy. So even public level 2 AC charging is a substantial savings over gas.
75 miles for $4.94 in the Bolt vs 75 miles for $13.50 (at $4.50 a gallon) in a 25 MPG car.
Public DC fast charging is more expensive.
Electrify America charges 43 cents a kWh with no subscription or 31 cents a kWh plus a $4 monthly subscription fee.
Let's assume that if someone is going to rely on public DC Fast charging that they will pay $4 for the monthly subscription and drive 1251 miles like I have so far in June.
In June my 1251 miles have used 367 kWh at a cost of $46 charging at home. If instead I charged exclusively at Electrify America I would have spent $4 + $113.77 for a total of $117.77. Again assuming a car that gets 25 MPG and driving 1251 miles, that car would have used 50 gallons of gas at $4.50 a gallon that would be a cost of $225.
View attachment 678504
So even paying to exclusively charge at the higher DC Fast charging rates, electricity in Georgia is still substantially cheaper than gasoline at 25 MPG and today's gas prices.
Drive a car that gets 50 MPG? That substantially changes the numbers and makes the gasoline powered car virtually the same cost over the 1251 miles when compared to charging exclusively at Electrify America assuming the same $4.50 gasoline cost but is still several orders more expensive than an EV that charges at home.
Gas has to get very, very, very cheap to beat home electric rates, at least in the state of Georgia.