It's not bad hey!
I feel if the car was more aero or drove at slower speeds (say 80 instead of 110) it would be much better again.
The return trip was a fair chunk better on fuel, it's either because we were heading down hill from Sydney (joking..) or because about 2 hours towards the end of the trip were spent in fog driving slowly trying to see what was coming our way.

I did run a 5mm spacer by choice, but not required.

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