Easy, say, one drive like a mad man at 180 Km/h, than brake like a girl to 40 km/h when approaching corners. Another one drive at 80-100 km/h constantly. which one is faster in real life average speed will tell. I actually quite agree with Unique that average speed is useless. I would prefer a digital speedo + analogue (just like the holden one). When comes to speed camera or school zone , this digital speedo really comes into handy. I agree 100%.........(my 2 cents)