Thanks for posting that. While I somewhat agree that I don't worry much about saving fuel on my bike or trike (at least until I'm already on reserve and 30 miles from the nearest fuel stop), I do burn a lot of diesel fuel transport stuff from point A to B.
I didn't learn much that the last 40 + years hadn't already taught me but, it was a good refresher. Although, worn tires may get me better mileage, I'm not sure it's worth it when it comes to fuel savings versus traction.
Rams
from the report it is never reporting about a bald tire.
According to Bridgestone, the tire tread accounts for 60–70% of the tires’ rolling resistance. Not only do the tires differ in rolling resistance when new, but as the tread wears, the rolling resistance of the tire changes.A 7/32 tread wear represents~10% reduction in rolling resistance (5% better mpg)compared to a new tire.