I didn't see it listed with Lap times and such as expected. I know the manual is for A6 and variants (RS 6) and it says the Acceleration Measurement applies to some vehicles, but surely the RS 6 is the vehicle it applies to and has this feature!?

 

On the instrument panel information tab, if you use the left button on the steering wheel this brings up sub menus and the tab you require is there on the RS models only.. Hope this helps