No, listen to what Phil says. It can only be used at the MAT when the team is being eliminated. Now ... does that mean when Phil actually says you are "have been eliminated"....or do they have to GUESS? Wouldn't it be something it the team only THINKS they are last but in reality aren't?
Haha, I just watched the video and heard what he said. I must admit, I didn't watch the video before posting my last comment.
Now knowing it has to be used on the mat, I think the best way to handle this is for Phil to ask the team every time they arrive at the mat whether they want to use the Save or not, BEFORE telling them what position they are.
So the scenario would go like this:
1) Team arrives at mat, not knowing their position for sure.
2) Phil asks them whether they want to use the Save.
3) They must then decide whether they need to use it or not.
4) After deciding, Phil reveals what position they're in.
This would make for drama at the Pitstop, as the Team could use it and end up wasting it, or decide not to use it, and end up being eliminated.
EDIT: Also, just to add my two cents about the chances of the 2nd last team being eliminated if the Save is used on an Elimination Leg, I honestly can't see it happen. If anything I'd say production will just make the following Leg a NEL. I would assume it'll work the same way as the Salvage Pass did in TAR Oz 2.