I must be the saddest keeper of mileage/economy data of the D2 S8 owners. I handed over the file from my last S8 to Davids8 with every tank of petrol recorded. I'm doing the same with the current, remapped, S8. 
Both, sometimes, would give a range of a little over 500 miles with a full tank, but you're lucky to get 400. And, overall, if you honestly get more than 23mpg form an S8, then you need to enjoy it more! 
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2002 Final Edition S8. Ebony black with Silver Grey leather and myrtle wood trim. Current mods: solar sun roof, 20mm rear spacers, 15 mm on front, red brembo callipers, 6k headlights, rear view camera, engine remap, alloy dash dial rings, alloy navi rings, tt/phaeton pedal upgrade, (and custom matching foot rest) dension ipod interface & parrot hands free kit (both fully hidden), av input, tv in motion switched thro' PF switch in blanking plug right of steering column, Audi 'quattro' sill covers, repositioned centre console switches, radio clock, .
Planned mods: auto-dimming rear view mirror, dash cam (as steamship's), fit the ski hatch, refit philips drl's (or maybe not - nope, definitely not - horrible botch!).
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