You're doing well on your fuel log. I guess aerodynamics of the Vectra must be very similar to the Xantia. My modifications are going to be similar to yours.
I did think that some extra bodywork to enhance the hatchback area would be needed, but since the flow stays attached to the hatch I don't think this will help. (according to FI anyhow!)
The Citroen C4 coupe and many other cars have a very flat hatch and a lip at the end of it, this will also be interesting to model and easy to implement.
I am physically working on undertrays in between the summer thunderstorms!, next will be rear wheel arch covers. Of course the car that the Xantia replaced, the BX, had partial wheel arch covers...
What do your wheel dams look like?
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