But I do. Tyre degradation is irrelevant when the car behind you is so far behind that it cannot take advantage of it. As simple as that.
If you are 30 secs ahead from the car behind and lappint at the same pace, it is totally irrelevant if you hit a cliff with five laps to go and suddenly start lapping 3 secs per lap slower. Totally irrelevant, because you will lose 15 secs which will still give you a healthy 15 secs of advantage on your competitor by the time you reach the checkered flag. And in those circumstances, if you have the chance to gain a position by pushing and you decide to nurse your tyres instead, you are simply gifting that position by giving up the fight.
Now, in Raikkonen's case (as per the discussion in the Autosport thread that I understand people were referring to here), Grosjean was not an issue plus he had Alonso on track on the same tyres but some 8 laps older. That meant that he could push, as Alonso was doing, and he would know 8 laps in advance when tyres were hitting any type of cliff, so he would have had plenty of time to react. Obviously he lost that reference when Alonso pitted, but that was with 13 laps to go, so Raikkonen only had to worry about what would happen in the last five laps as he knew that Alonso's tyres had not hit the cliff.
By the way, Alonso did not pit because he was losing time to Raikkonen; he pitted to cover Vettel. He was more than 16 seconds ahead of Raikkonen with 13 laps to go, had Vettel stayed on track he would have taken the gamble and stayed out too - but Vettel was on very old softs, so he couldn't go till the end.
Edit: I have just checked, and Alonso was in fact faster than Raikkonen in the two laps prior to him taking his third pit stop. So definitely he was not reacting to his tyres giving up.
http://en.mclarenf-1.com/index.php?p...nando%20Alonso
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