Goodyear plans to replace the petroleum-derived oils used in its tires by 2040.

And while this might not seem like a lot, the company has announced that it is replacing about 11 ounces of petroleum that would otherwise be in tires that the company has on offer for city transit buses with soybean oil.

This is the formulation being used for the majority of its Metro Miler G152 and G652 tires.

Dustin Lancy, Goodyear North America commercial product manager, notes that if you take the 11 ounces and “Multiply that by a bus fleet of 1,600 buses, about the size used by some major metropolitan cities in the U.S., and that could mean the use of around 20 fewer barrels of oil.

A typical city bus has six tires. That translates into the replacement of 66 ounces per vehicle. One barrel of oil is 5,376 ounces or 82 buses.

Small amounts, but something.

Know that the U.S. uses about 18 million barrels of oil. Per day.