Audi 100 Avant Duo
Hybrid tech is nothing new, with this plug-in prototype dating back to 1989
Audi e-tron Spyder
Although Audi's e-tron brand is usually reserved for EVs, there was also this hybrid
Audi Avus
Fast and curvaceous, the Avus was seriously considered for production
Audi Avantissimo
The Avantissimo could have been the world's first production luxury estate, but it wasn't to be…