Which engine option is more fuel-efficient for the Audi A6?

I am in the market for an Audi A6 and am looking for the most fuel-efficient engine option. What should I consider when choosing between the 45 TFSI and the 55 TFSI engine?

The 45 TFSI engine has a slightly better fuel efficiency with an estimated 24 mpg in the city and 32 mpg on the highway. However, if you plan on driving in mostly urban areas, the 55 TFSI engine has a mild-hybrid system that can improve fuel economy by about 6 mpg.

If fuel efficiency is your top priority, consider going for the 45 TFSI engine. It also has a smaller displacement, which may result in lower maintenance costs in the long run.