I definitely wouldn't buy an EV based on lower service costs.
- check the brake fluid for water - change the cabin air filter - change the gearbox oil - check/change the battery coolant
If you're going in more frequent than that you're getting a very expensive windshield wiper replacement.
The real kicker is going to be repair costs. An EV has about 10% of the moving parts of an ICE car, so in theory repairs should be much less frequent. But if the ICE is a Toyota and the EV is a Tesla, YMMV.
You'll probably have to replace the battery at around 250,000 miles but at that point the car is worth pretty much scrap value anyways.
I replace mine annually, but it's easy enough to do myself (right behind the glovebox, needs zero tools)
> In reality you can probably bring your EV to the dealer once every 4 years or so.
Not really, I need twice-yearly seasonal tire changes/rotations.
I could budget for yearly service (rather than the never-service-until-required plan I went with) that would presumably lengthen the lives of my brakes as far as corrosion is concerned, but at current shop rates that would cost more than what my brake replacements cost.
Are you somewhere where you actually need dedicated winter tires or have you just convinced yourself that rocking all weathers all year isn't feasible?
So, living in Alberta, and spending significant time in the AB/BC rockies in the winter, I still think all weathers would be feasible, but I'm more comfortable with dedicated winters. (For that matter, when I'm buying winters, I'm always borderline on whether I should get studded or not.) (And as a parallel effect, with dedicated winters I can also run higher performance all-season tires during the summer.)
And if I ran all-weathers with my driving patterns, I'd still want to be rotating them yearly, so that would cut my dealer visits by half, but definitely not to once every 4 years.
And tying back to my last ICE vehicle - for the first 4 years of its life it would have been okay without a dealer visit if you took tires/oil changes out of the equation, but not for any 4-year period after that. There are just too many random little things that break down in cars over time. (e.g. after 12 years or so the cruise control buttons were getting really mushy - I replaced them myself for the cost of the $65 part, but YMMV on whether you feel a service visit is warranted when removing your steering wheel air bag.)
Also rotating tires every 10-20k miles is good because most cars run higher camber in the rear (inner shoulder wear) than front and the fronts wear the outside shoulder more because of turning. Swapping them extends tire life by spreading the wear.
Not about all seasons, which are not rated for winter use.