That 15% is in the USA, a country that has largely shipped it's manufacturing overseas. Globally it's estimated to be a smaller percentage overall, although it

That 15% is in the USA, a country that has largely shipped it's manufacturing overseas. Globally it's estimated to be a smaller percentage overall, although it does seem that it still is closer to 10% according to this: https://www.iea.org/energy-system/transport/cars-and-vans https://www.iea.org/energy-system/transport/cars-and-vans So yes, maybe it's not "tiny". My point still stands, I think. We are focusing much more than 10-15% of our overall efforts on optimizing a slice that doesn't seem like it will contribute improvements relative to our efforts