You have a good average. I often do 62mpg on intercity roads at an average speed of 100-110km/h. My best average is 72mpg (3.9L/100km) on highway at about 95-105km/h (in special conditions).
When you'll have the time you should check that rubber piece or will make you a hard time on short corners and climbing hills (when is less than 1/4-2/3 fuel in the tank).
It's not a hard job... I did it in 30 minutes.
Good luck!
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