Why should I have to investigate things that I wouldn't want in a million years, Doug?

Because it could save you a fine, points on your licence and possible increased insurance premiums. You have been caught 4 times. Why make it a 5th?

If you want to take account of the 10% under-reporting of your speedometer, then nudge it up a couple of mph. It's easy enough to flip it off, using the buttons on the steering wheel, if you need to get past a slow moving vehicle and then re-set it once you have completed your manoeuvre. Like all things, the more it is used, the less you have to think about it.

DC