In an effort to demonstrate the fuel efficiency of the A4 TDI, Audi France recently invited a dozen journalists to go for a drive. The teams set off in pairs driving six A4s powered by the 2.0L TDI from their starting point in Paris. They ended their journey in Madrid Spain after covering a distance of 1,260km (783 miles). The winning team used slightly less than 17.8 gallons of diesel. If they had run out the all the fuel in the tank they could have covered almost 907 miles. That comes out to an impressive 52.9 mpg (U.S.) in real world conditions. The other five teams all managed to be nearly as thrifty with their fuel allotment with even the worst team managing 49.8 mpg. The 2.0L TDI is the same engine that will be arriving in the VW Jetta this summer and an A4 TDI should be available in the U.S. next year.
[Source: Autoblog.it, via German Car Blog, thanks to Christian for the tip]