My maintenance costs per year would be about $200 not counting tires. But I do all my own work and vet my vehicles well before purchasing them. Most people's would be higher, though, since most don't do their own work.

But in comparison to all electrics, the savings aren't as much as you're thinking. There's still a huge load of things that can/will break down on an electric. Shocks, struts, wheel bearings moreso than an ice vehicle.

To give an example, I'll use the 3rd most sold all electric of last year; the mustang mach-e. I'm skipping the first two because they're teslas and absolutely ridiculous in high prices to get parts for.

I'll start things off with the worst one.

So the battery itself (I'm looking these up as I go) is a holy shit $23,000 just for the part itself and only has a 100,000 mile warranty that it will have at least 70% capacity from when you buy the vehicle new. Wow, would that absolutely suck. You can buy new ice engines and have them installed for you for under $10,000. Way under in many cases.

Looks like the electric motor itself is around $4,000 if you got the all wheel drive version you have two of these to worry about. Then theres the inverters for the motors. Those are $1,700 a piece. I'm not traking down prices for the rest of this stuff. You get the idea.

You still have a single gear transmission to worry about that needs fluid changes.

Also antifreeze and a pump.

Brakes and brake fluid

Calipers

Several different control modules

Sensors

Etc etc.

Basically your maintenance free stuff that you don't have to do to an electric you do have to mess with on an ice consists of plugs, ignition coils, serpentine belt, oil, injectors, fuel pump, and a timing belt if you got a vehicle with a belt and not a chain, throttle body, air filter and a few sensors. Aside from the oil and air filter, most of that stuff are things that need addressed every 80,000 miles or if they break.

That's close to about it on what you no longer need to mess with. An electrics transmission should almost never break down so long as it's fluid gets changed, at least. They're quite simple bits.

So most "maintenance" and upkeep still exists for electrics. You just don't have to spend 30 minutes changing oil every 4 to 8 thousand miles. There's also a lot of extra that can break and cost a lot to fix on an electric. Then other things that break faster.

While most of your big ticket items like the electric motors and the inverters are left to a chance at going out, just like a chance of an ice blowing a rod out. It's an absolute fact that your evs battery will die and that every single month that goes along you'll get less and less capacity.

You want to save the environment? Instead of being forced to spend thousands more on an electric vehicle, buying a small ice vehicle and taking the $10k you saved and installing solar panels to your houses roof will do more.

What’s the maintenance costs for 15 years in an ICE vehicle vs electric?

Probably significantly less than the cost to maintain roads because now every vehicle would be significantly heavier. Oh and bridges!