Somewhat cheaper anyway (30% according to https://www.thecarexpert.co.uk/petrol-vs-electric-servicing-... ), but I wouldn't be surprised if that is wiped out by the increased insurance costs.
I definitely wouldn't buy an EV based on lower service costs.
That's based on the manufacturer's "lets not upset our dealers" maintenance schedule and is completely unnecessary. In reality you can probably bring your EV to the dealer once every 4 years or so. On that schedule you should:
- 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.