It might be less expensive due to the electrical powerplant. It will take a while before there is enough of a track record to know for sure. But, for example, electric cars are much lower maintenance than gas cars, as Tesloop as shown.
Disregarding that they have a lot of free "Goodwill" replacements - their post-warranty maintenance costs are about $0.17/km - my ICE Ford is at $0.09/km over the past seven years post-warranty. (And I think I've included more items in my spreadsheet, since I've got the cost of things like windshield wipers and fob batteries, which they omit.)
edit: I thought looking at entire lifespan of the Tesla might be unfair since that includes a much longer period when it's significantly higher mileage than my car, but taking only an equivalent post-warranty period is even worse, it's about $0.24/km in maintenance over that time frame.
https://cleantechnica.com/2017/09/05/10492-tesla-model-s-mai...
https://www.tesloop.com/blog/2018/7/16/tesloops-tesla-model-...
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