The famous 67MPG requirement was for a hypothetical 2026 model year car
But Honda discontinued the Fit in the United States in 2020, long before the hypothetical 2026 target.
The reason is consumer demand. People weren't buying them. There are thousands of lightly used Honda Fits on the used market for reasonable prices, but they're not moving.
Yes, the regulations are flawed, but that doesn't change the lack of consumer demand.