They conduct certain improper tests.

A revelation now seen by me.
They manipulate intentionally… so far just us...
We’re left feeling lost and used.
Yet we need them...
What is this existing “partnership?”
Why do I need Mr. Nakao?
I am tougher… Considering...
I have voluntarily stayed decades
Through scandal and manipulation...
Recalled and acknowledged by me
And we need Mr. Nakao
Not because he disappoints us
But because he completes us…
He no longer could disappoint us.

Natalie Tetzlaff; “Mitsubishi Used Improper Fuel-Economy Tests for Some Cars Since 1991”