They do. 8 years / 100,000 mile warranties suggest that ~3 sigma lifetime is at that level. IOW, Tesla likely believes that >99.5% of all cars will not need a warranty battery replacement by that point. To hit that level, the average car needs to do a lot better than that.

> Also, ICE gas tanks don't get smaller over time.

If measured in miles/tank, they definitely do. The gas mileage a 10 year old car gets is worse than the same car when it was new.

The warrant the same and more than what is powertrain warranty on ICE. this worry about battery is just silly, especially newer batteries. I had more trouble with ICE once I hit 100k than with the EV. Personally, with 11-year old Tesla S - still on original brakes (you don't really brake with regen braking) - battery is at 90% (free supercharging so the car has basically always been supercharged) - replaced tires once, at 60k - had to replace a model to move to 5G - have incurred not a single penny of other expenses in the last 11 years

which is most people don't know how to drive EVs with maintenance in mind.

so basically what you are saying here would be like if I took my iphone and put it in the oven and then complained that it doesn't work quite like it should...