It could be an A2 3L, which shares the drivetrain etc. with the VW Lupo 3L, so named because it used just 3L of diesel per 100km (under ideal conditions, of cou

It could be an A2 3L, which shares the drivetrain etc. with the VW Lupo 3L, so named because it used just 3L of diesel per 100km (under ideal conditions, of course). I don't know of any current Audis with similar repeatable fuel economy.