More than 20% use tires.
But I guess if the most important thing for ya all is to be of the hook personally, sure, fixating on the question of individual responsibility becomes the most important part and averages are just a distraction to that (because they say nothing about the individual). To me that wasn’t the relevant takeaway from the article. Our society must fundamentally change, or we will destroy ourselves. And for that it doesn’t matter at all how much microplastic you personally produce, but how much we all create - on average.
Your mom broke the garage. That was absolutely irresponsible of her, not you, you were trying to help out which is really sweet.
And I mean what was the goal here anyway? Even when running late the 3 seconds it takes to start a car will hardly make any difference.