> Edit: This study suggests 12 year old cars have at most 2x the relative risk of fire as 2 year old cars. That's bad math, the study does not say that. It doe

> Edit: This study suggests 12 year old cars have at most 2x the relative risk of fire as 2 year old cars. That's bad math, the study does not say that. It doesn't give any information about the ratio of number of cars on the road of different ages. If you looked at the fires that the study categorized by age you could say that 3x were from cars that are 12 years old compared to cars that were 2 years old. But that's not what you are claiming. Even if you said 2x instead of 3x, your math would be nonsense because it would require that there were the same number of 2-yr old cars on the road as 12-yr old cars. But no reasonable person would possibly think that because the lifetime of a modern car is only 12 years on average (and even if not for that, it's incredibly unlikely given that significantly more 2-yr old cars were built than 12-yr old ones).