What is the difference between Audi A8 55 TFSI and A8 50 TDI?

I am currently researching Audi A8's and am confused about the different model names. Can someone explain the difference between the Audi A8 55 TFSI and A8 50 TDI?

Both the Audi A8 55 TFSI and A8 50 TDI are part of the A8 series, but the main difference lies in their engine type and fuel efficiency. The 55 TFSI is a petrol engine, while the 50 TDI is a diesel engine. The 55 TFSI offers better fuel efficiency, making it a more environmentally friendly choice, while the 50 TDI has a slightly higher torque and may be a better option for those who frequently drive long distances.

The numbers in the model names represent the engine size in liters. So the A8 55 TFSI has a 3.0L engine, while the 50 TDI has a 4.0L engine. This can affect the overall performance and driving experience, so it's important to test drive both models and see which one suits your needs best.

In terms of cost, the A8 50 TDI is generally more expensive due to its larger engine. However, it may also have more advanced features and technology compared to the 55 TFSI. Consider your budget and desired features when deciding between the two models.