Kubica will, i feel try and use one engine above the 2500km lifespan, posibly try 2800 or even take it into the 3000km mark to avoid the 2 engine penaltys he will inevitibly have to take.
I feel that Sutil and Vettel will both take a engine penalty each. But i feel that they can just about get there with some really creative engine management.
Toyota could be in real trouble, altho most relyable at the moment, that fact they will eventually soon have used up all 8 and not have at least 1 frest block for the last 2 races, as i think that could be needed for all teams.
I can see Toro Rosso ending the season by just using the 7 or even 6 engines. if they keep up the 3 races per engine work they have been doing so far. BUT this is the thing, if Red Bull have Vettel in the hunt for the title towards the end of they year, they will give all the support to STR to set up the STR4/RB5 and i can see those 2 fresh blocks being the diffrence to them as they will be needed to keep the Brawns futher down the grid and make it difficult for Jenson. Hence why Red Bull have part worn in a engine for Vettel and 2 for Webber, keep them fresh for the end of the season, posibly for use at Brazil to keep a fresh block for Yas Island.