Did anyone actually slow down to 55 MPH in 1974?

All I know is, I commute every day and I do 80 and people are still passing me like Im not going fast enough :)
Funny
My bronco is the exact opposite
I'll have the needle not a hair passed 65 and I'm passing everyone like they are on pit lane

I'm starting to think the P.O. forgot to change the Speedo gear when he slapped on the 35s