The car :
Audi A6 3.0 TDi Auto Quattro 2009 facelift
CDYA engine code
The problem :
Hold a constant 2/3 's throttle - run through the gears without deviation - 1,2,3,4 all pull strong, smoothly drops into 5th and goes flat, still accelerates, then pulls strongly again in 6th
The fuel econ...