Pretty sure the cameras have some leeway built in, and in addition your speedometer will probably read a few mph under at 70, unless you're using one on a satna

Pretty sure the cameras have some leeway built in, and in addition your speedometer will probably read a few mph under at 70, unless you're using one on a satnav. I do agree though, I tend to just try and find someone else who has cruise control and keep a steady distance behind them.