I dunno, think mine is 80 litres although 73 litres rings a bell too for some reason. Maybe the auto box in yours hurts the economy a bit and the FSI is more efficent on the RS4 
The B7 RS 4 will never be as appealing to me as the B5 RS 4, but the one in this video would be the perfect Audi for me. I'd have bought one over the 6 but I wanted something more powerful. This B7 however, I love. It's the ultimate.
http://vimeo.com/35332260
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2009 Audi RS 6 Saloon V10 - 420mm Ceramics, Keyless, Soft Close, Adaptive Cruise, Glass Sunroof, Blinds, Twin Pane & UV, Freeview & DAB, High Beam Assist, MTM bits, Audi Exclusive Bits, MRC, Milltek, GYEF1 ASY2's, Bluetooth streaming music to AMI mod - 753 PS/1021 NM
2016 Audi S3 Saloon, Sepang, S-Tronic - B&O, Tech Pack etc... Company Car
1995 Audi A8 4.2 V8 quattro Sport - Bose, Solar, Blinds
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