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I wonder if it’s because there’s more passengers per model Y on average than a two-door sports car!

One fatal model Y accident might cause half a dozen gas fatalities, but a Porsche wrapped around a tree might kill just the lone driver.

Both the comment and TFA clearly indicate it's measured in terms of fatal accidents, not fatalities.

I would guess that having more than one passenger increases the chance of at least one of them dying in an accident

Good point too. Things that the authors should've thought about.