Originally Posted by 
Tins
				 
			Speaking of rabbit holes....
 
I think you will find that nearly all newer cars are built this way. I was once told that it was in fact a mandate, but I have no evidence of this. However, it is one of the reasons people scream "SPEEDING" when a heavy vehicle is involved. Speedos in modern prime movers are usually accurate, because they can be calibrated for different axle ratios and tyre sizes, so when they say 100 they mean 100. Nearly 10% faster than the car that says 100 when it means 92.