Partial Zero Emissions...?

Subaru SmartWay™ Vehicles

Subaru offers the most fuel efficient All-Wheel Drive vehicle lineup in America.* Subaru also offers Partial Zero Emissions Vehicle (PZEV) certified Legacy, Outback, and Forester models which are available for sale anywhere in the U.S. Subaru PZEV vehicles meet California's Super-Ultra-Low-Emission Vehicle exhaust emission standard.**

Is it me or is society just tolerating more and more stupid language? Subaru claims to have a Partial Zero Emissions Vehicle OR PZEV for short. How can something be partially zero? I've done the math and as far as I can tell it's zero OR it's not zero. In this universe, in this dimension, despite what those kooky string theorists claim, something cannot be PARTIALLY ZERO! What is this the Princess Bride!? Like Billy Crystal convincing us that he's only partially dead? See that's fiction.

George Carlin, Joe Pesci rest his soul, would have a field day with this.