Lets try to keep this topic on the A8 there is other topic on that A2 lightweigth project here...
This bad ass A8 is on the road and already crushing some records. Best fuel consumption so far is
4.24 L/100 km
55.55 mpg (US)
66.66 mpg (Imp)
1.8 gal (US)/100 mi
606.69 Wh/mi
What you should be comparing the car are these other A8 on the road
.
http://www.spritmonitor.de/en/overvi...ml?powerunit=2
So everyhting is looking nice conserning the 3 liter fuel consumption target as. Next some aerodynamic mods like grill blocking and smooth underside paneling and this should go to about 3.7-3.9 on next 25 liter test tank easily as this current best had some unnecessary acceleration and 50 km of traffic light driving which really hurts the FE in big car like this.
Also the ECU tuning needs to be fixed to this heavier body car and bigger turbo. At the moment there is lot of black smoke coming in bigger uphills as the ecu map drops out of efficient tuning "map" to acceleration map.