I'm pretty sure my speedo is accurate too, for the same reasons as Clubman above, and from tailing a friend's new VW Golf at sixty for a couple of miles.
Don't know the acceleration times, got no way to tell, but plenty of very satisfying torque.
The sensation of speed is subjective, and opening the bike up after being stuck in an unpassable queue for a spell is a glorious thing. The bike suits this old bloke just fine. Japanese missiles scream past me, but they're not having what I'm having.....