Why would you switch to metric?

I weight 160 lbs. I have no idea how many Kg that is.

I'm 5'6. I have no idea how many cm that is. I think it's 165 but I'm basing that on a 12" = 30 cm ratio. It's really 12 inches = 30.64 cm.

I drive on the highway at 100 km/h. That's around 62 mph
I can tell you that I max out at 100 mph on the highway but that's only a coincidence that 100 mph = 160 kmph
(actually it's 100 mph = 160.9344 kph)

:D I like both imperial and metric