I once did some real-world driving tests with an A6 Limo 4F 3.0 TDI and an identical Avant model.
According to the speedometer, the limousine is running at 265 km/h, while the Avant is managing 225 km/h with difficulty. These are readings from the speedometer.
Actually, it's completely the same; both times, it's acceleration from a light roll with a kickdown to approximately 200 km/h.
Does anyone notice any differences that might be significant?
AVANT (max. speed approx. 225 km/h) ENGINE: 4F0 910 401 N; WITH DPF!!