Would you be absolutely floored if it did 800 miles on a 19 gallon tank? Yea, I don't know how this car (the Audi A8 TDI) did it either, but it's pretty. damn. impressive. Video on this page --> http://paultan.org/archives/2006/02/23/audi-a8-40-v8-tdi-excellent-fuel-economy/ Wanna kill these ads? We can help!