Line height spacing for text in ggplot

You may be looking for a combination of options. The closest to lheight is likely setting lineheight in element_text. I also made the font smaller, just to show options.

ggplot(data = df0, aes(x = car, y = mpg)) +
  geom_bar(stat = "identity") +
  coord_flip() +
  theme(axis.text.y = element_text(lineheight = 0.5, 
                                   size = 6))