gav Wrote:
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> As far as I'm aware, you don't have to run your
> race engine on the Friday. Could swear I heard
> that somewhere, but after a quick glance through
> 28, I can't see it. Perhaps I just dreamt it. :\
No, I'm pretty sure that you are correct. The intention of extending practice on Friday was to effectively make it like a test day, in which the teams can do pretty much as they please (within reason) including running a different engine to which they race.
And if we look back to mid season, Alonso had a series of car failures, oil leaks etc both in testing and in Friday practice at the Grand Prix. And he remarked at the time that perhaps the team didn't prepare the test engine (used on Friday), quite as carefully as the race engine.