I've just taken the dogs for a walk seperately ( one pulls you the other one you have to drag ). I took them to the Cemetery near me, thats 0.7 miles away, my Mi band says i've walked 4900 steps and that its 4.2km .
so 0.7 miles * 4 (2 trips there and 2 back) = 2.8 miles
2.8 miles is 4.5km, so roughly i'm .3km out
I'd recommend a MI band 2, for the price you cannot get anything better