What is the optimal fuel type for Audi cars?

I'm thinking of purchasing an Audi, but I'm unsure which fuel type is the best for my car. Can you provide any insight?

Diesel may offer better fuel economy and emissions, but it also comes with a higher price tag. Plus, diesel engines usually require more expensive maintenance.

While electric engines may have a higher upfront cost, they can save you money in the long run with lower fuel and maintenance expenses.