In theory, you should be able to save on maintenance and fuel.
There's not much to maintain except for tire rotation just like a gasoline car, cabin air conditioner every 2 years... See the complete schedule:
Unlike gasoline cars, Tesla vehicles require no traditional oil changes, fuel filters, spark plug replacements or emission checks.
www.tesla.com
I drove 100,000 miles on my 2012 Model S and my maintenance was also minimum and the brake pads were still almost like brand new due to regenerative brakes and the rare use of friction brakes.
I said theory because EPA says you can get 272 miles on your full battery and 54 MPG on your Toyota Prius Prime but those are just laboratory numbers. Still, they are useful for comparison.
Your battery capacity is 60 kWh and the SCE rate for residential off-peak TOU-D-Prime is $0.19.
You multiply them together and you can see how much it cost for each 60kWh battery:
60 kWh x $0.19 = $11.4 / battery.
Since each battery can run 272 miles, you do the math:
$11.4 / 272 miles = $0.04191176471 / miles
The 2022 Toyota Prius Prime is 54 MPG, so let's get the equivalent gallon price for the Model 3:
$0.04191176471 / miles x 54 MPG = $2.263235294 / gallon.
So if you see the price on the gas station is $2.26 / gallon then you are breaking even.
If it's higher, then you are saving money for fuel on Model 3.
Even if the gasoline price is very cheap, I still prefer EV because of its convenience: No noise, no smoke, no stopping by a gas station, no oil changes... I would be willing to pay for the convenience and skip gasoline hassles.
It might be unfair to compare the expensive Model 3 with the economy class Prius, but it's just an illustration of how you can do the maths yourself.