2025 Audi A3 Review Car And Driver. The most fuel efficient audi a3 is the 35 tfsi mhev with a 7 speed auto s tronic which is powered by a 1.5l. There are 4 different fuel economy figures for the audi a3.

Interior tweaks include a new shifter and other changes to the center console and dashboard. It’s comfy enough up front, but the small rear seat and tiny trunk.