Gotta love the VAG TDI's -
Here are some VAG weight/MPG -
The 1.9 tdi in the 2,943lb A3 gets 64MPG
The 2.0 TDI in the 3,395 lb A6 gets 57MPG
The 3.0 TDI in the 4034 lb A8 gets 44MPG
The 3.0 TDI in the 5,125 lb A6 Allroad gets 43MPG
The 3.0 TDI in the 5,125 lb Q7 gets 34MPG