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Of course no one really knows where the engines are in relation to each other - any car that can run a bit less wing (ie is more efficient) will look quicker down the straights for example. It could be the case that the Williams this year is just not very slippery. On balance though it would seem that BMW have slipped from their highly regarded position as most powerful engine - I have read a comparisson of maximum rpm (a pretty good gauge of max bhp) that puts them down in about fifth place. Most likely they were wrong footed by the two race engine rule, and the primary method at their disposal to mangage longevity is to knock the rev limit down during the races. This is consistent with what the drivers have said.
Oh - and also it might be the case that the radically small sidepods of the FW27 make the car very tight on cooling. If the team's relationship with their engine supplier is less than perfect that kind of issue could be easy to fall in to, and very tricky to solve.
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