I always considered the speed limit as a MAXIMUM speed aloud on the road and as you have stated - drive to the conditions. But then my driving teacher said "you can't be under that speed by much or you'll get booked". And I've actually had young (p platers) girls tell me that I should go faster because I was only doing the speed limit and your supposed to go 10km/hr over it! Using that theory if they increase the speed limit to 130 do we have to do 140? Tell you what I've overtaken someone at that speed in the D90 and I'm not keen on holding it there EVER! I'm sure it's safe, i'm sure the car can do it all day long, but there is no way you'll catch me doing it.
And plus I can't afford to pay the fuel bill.
Come to think of it! I drove from Mackay to Brisbane a few months back....
I found that when I increased speed from 100 to 110 (there is a section between here and rocky) my fuel consumption went UP big time, so much so that I drove at 100 on the way home and on every subsequent trip to rocky.
I believe that during WWII the good old USofA had a fuel shortage. I heard that they lowered speed limits to a meer 80km/h, apparently the country saved some crazy amount of fuel.
2003 I purchased a Ford Focus brand new.... my pride and joy at the time (i was 21 and bought it cash!) Reading the owners manual it stated that tyre life will DOUBLE if you drive at 80km/hr over 100km/hr. DOUBLE the tyre life from 80-100!!!! That's huge! I didn't drive that slow for 50000kms to check. If my tyre life will drop that far just getting to 100km/hr then what will happen when I go to 130?????
Between fuel and tyres I dont think I want to go that fast. I might stick to my Series..... and drive at 80 
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