To paraphrase a man I hate - "It's not speed that kills, it's the sudden stopping"
I don't care how fast I go, and that means how slowly I drive sometimes and how fast I drive sometimes. I don't pay any attention to the speedo, at all.
Of course, I'm living in a country where speeding tickets have not yet become the fashion, let alone efficient traffic policing.
So I drive according to conditions and am fast, but not suicidally fast, a lot of the time. But sometimes I'm slow, slow - not like a tiger