The 0 1 2 0 refers to which computer. I can't remember which way round it is but one of them refers to the average of the car since reset and the other is of that journey. I think it is
0 - reset main average
1 - main average
2 - journey average
0 - reset journey average.
Almost.
1 is trip details since switching ignition on (resets after an hour of ignition being off)
2 is for details since last reset (resets itself when it gets to 9999 miles I think)
first 0 is for resetting the details since ignition, and second 0 is for resetting the details since last reset.