In a report dated August 1, 2022, a special investigation committee described how Hino Motors had falsified engine certification data. Its summary says that developers could not speak up to say that fuel economy needed further improvement. They could not tell developers in other departments that the earlier figures had been inflated. At one development meeting, the fact that fuel economy fell far short of its target was not reported.
The news site Kuruma News summed up the problem in one phrase: ue ni mono ga ienai, unable to speak to those above.