I usually drive at the posted limit.
If the limit is 50 kph (30 mph) in the city, I do 40 mph.
If the limit is 60 kph (40 mph) around town, I do 50 mph.
On the highway 80 kph (50 mph) = 70 mph
On the freeway 110 kph (70 mph) = 90 mph
Naturally there are usually bursts of
of speed up to the limits of nerve and physical conditions.
I have had my SSEi up to 210 kph (128 mph).
The fastest I have driven in my Firebird is 155 mph.
There is a particular stretch of coastal highway here between two Ferry runs. It'* like a one hour race from one end to the other along a mix of twisty and straight road. When it'* busy, you want to make sure you get on the Ferry in case it fills up and you have to wait 2 hrs for the next one. So needless to say............I'm usually the first one to the terminal at the other side.
And the bonus is that there is rarely any Federales around to bother with regulations, it'* so far out of the way....they'd have to leave the do-nut shop.
It'* a fun run but hard to justify the $50 cost of the Ferry just for the pleasure of the drive.