CLEAN : US Volkswagen diesel drivers disappointed

The video discusses the disappointment in car performance, particularly regarding fuel efficiency and environmental impact. The speaker highlights the frustration of investing in a vehicle that fails to meet expectations and the potential consequences for manufacturers. Ultimately, the decision is made to trade in the car due to its negative environmental impact.

What does the speaker imply will happen to those responsible for the car's issues?

What environmental concerns are raised in relation to the car's fuel efficiency?