nura

I am looking purchase a A5 Cabrio of 2018 vintage or later.
In US, 2019s are speced as 23–34 mpg while 2020 and later are 23–31 mpg.
Are they any powertrain or wheel/tires change between these model years, any other significant changes apart from powertrain?

SMac770

No one knows the what/why of the EPA mpg hiccup in the MY20 Audis. Maybe they changed test process. Maybe they got a new employee. Maybe someone forgot the payoff that year.

The N/V ratio in the EPA docs changes from 26 for MY18/MY19 to 24.8 for MY20 then 23.8 for MY21/MY22. The 26 was just wrong. Maybe the gov't calling Audi out and forcing them to correct information, like the change to proper bhp numbers.

MY21+ S4/S5 use a different code of ZF8 transmission from the MY18-MY20; believe they did change ratios, to the RS5 ratios, at that point. Believe that to be the reason for the N/V change from 24.8 in MY20 to 23.8 for MY21 (8th gear changed from 0.667 to 0.640).