Above is how it was at BUB (FIM), but I don't see why it would have to be that way as long as the mile and the kilo are each over the same physical ground respectively. Aren't they separate records anyway as you posted earlier (I better go back and reread that). Now just because I don't see why it should be that way I guess if it is an FIA rule then that is the way it is.
On the second paragraph above you used the word "normally". So I guess you are saying that you don't have to have the same run-up to the measured mile/kilo from each direction, but that is the preferred method???
I like this stuff so keep it coming
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No, to FIA the are the "same" record, had to run on the same space. The reason is, if you blew the engine during the return run you can still make a kilo record, but may be not the mile. Best example, Blue Flame - Gary Gabelich went out of power before he left the kilo - his peak speed was 650+ mph - and he was coasting through the end of the measure mile, this was also the reason why there is big different between kilo and mile average.
Also for the FIA did only the kilo count as the absolute record - means fastest speed - the mile was only "another" record for the books over the mile. That this was good, see Richard Noble - without the mile record, he had no chance to get in the record book or has try again...
Why I wrote normally - if it happens that by some reason the car stopped behind the official end/starting line for the return run, he has not to be moved back to this starting line and can start from his turn around point without getting the trouble that the FIA would not recognize the two average as a record when he is fast enough. If he can start from this point.
Al in 91 was also running over his official end and has to be moved back, but here the reason was, that he got no chance to start from his turn around place - to soft.
Similar Andy Green at Black Rock - he missed the end by 1.4 miles due to a chute failure - he stopped in an area where was no chance to start, due to the missing guideline - don't forget - he was sitting between the two big jet engine and he need the guideline.