Could this be the novella [City of Truth][1] by James Morrow?

> Truth reigns supreme in the city-state of Veritas. Not even
> politicians lie, and weirdly frank notices abound—such as warning:
> this elevator maintained by people who hate their jobs: ride at your
> own risk. In this dystopia of mandatory candor, every preadolescent
> citizen is ruthlessly conditioned, through a Skinnerian ordeal called
> a “brainburn,” to speak truthfully under all circumstances.

[This review][2] mentions the 'Ford Adequate'

> I read this back when it came out, and
> had to see if it holds up (spoiler: it does). The story is
> unimportant: what you come for here is the setting, a city where
> people are conditioned (ala B F Skinner) to tell the truth. **Instead of
> a Ford Reliant you have a Ford Adequate**, and so forth. Lots of fun.
> Four figuratively pointed and bright objects.


  


  [1]: https://www.goodreads.com/en/book/show/218587.City_of_Truth
  [2]: https://www.goodreads.com/group/10252-book-nook-cafe/comments/22880326-mkfs