Start with what the Audi A6 C8 is: a car with gasoline engine, from Audi. What it meant takes a little longer.
The hardware
The engine is gasoline engine. These are manufacturer figures carried by Wikipedia and Wikidata, not road-test measurements.
Family and rivals
Its Audi stablemates include the Audi 200 and the Audi 225.
Owning one today
EPA combined economy is 29 mpg, about $4,100 a year in fuel at the EPA's assumptions. Condition, mileage and specification move any single car a long way from a headline figure.
The record
The open record for the Audi A6 C8 carries no verified engine, output, weight or price yet. MotorJury does not fill gaps with guesses; this entry gives the model a home in the catalogue and grows as sourced specifications and photographs arrive. Corrections: corrections@motorjury.com.