[salty_biscuits]

Rubber has a density of 1500 kg/m^3, a tyre wears about 5mm before it needs to be replaced. If I say a tyre has a radius of about 0.3 metres and a width of about 0.2 metres and plug this into the equation for an annular cylinder I get about 2kg of material lost between new and needs to be replaced per tyre. I don't know how long tyres last for most people, but I would guess about 50000km. So I would expect about 0.2 grams per km from tyres...

[Gibbon1]

I did the calculation in Freedom Units and converted to grams per km. Assuming tires last 60,000 miles or 100,000km and got 0.1 gm/km. So matches your analysis closely.

Notable I put 60,000 miles on my cars tires since I bought it. They are due for replacement kind of whenever.

[TheSpiceIsLife]

I hadn’t heard the term Freedom Units before, seemed obvious what you meant, looked it up anyway.

Universal measurements of American awesomeness. It encompasses all types of units (temperature, length, area, volume, speed, weight, GDP, etc).

https://www.urbandictionary.com/define.php?term=freedom%20un...