I have checked and no you cannot delete individual times from the Speed Test. Sorry. I would like that option myself for duplicate runs so that I could just store the best run in that car.
Talking about best run in cars, I have just run the acceleration test in the revised VW. For information I tuned it up to 436 PP before the update (which equates to 495 PP now the weight has changed). For the same vehicle with no changes from before, the 0-60 time has improved from 7.334 to 5.799 BUT the 0-100 time has actually gone out from 17.778 to 18.471 which seems a little odd. I am not saying it is incorrect, just saying it does not fit with a logical conclusion based on reduction in weight of vehicle? Can anyone else test this and see if they come to the same results?