Limit here on national highways is 100-110, I've rarely driven at that speed for over 2 minutes, just not possible, too much going on and to look out for. 80-90 is maintainable but then over the trip it averages out to around 60.
Did 500 kilometres in 6 hours once, doesn't sound like much but even after driving harder than I should or ever will, could only average about 80, just not possible here. From what my friends tell me, covering 100-150km/h on highways in Australia and United States is effortless.
I drive about 30,000 a year. I can not say that it is very much, but I think it is not enough. Unfortunately, spare parts change regularly, and since the car I have a very rare ( interesting gift ) , for my region, I have to order only on page in another country . In General, I need to drive less probably, to save money