ok... so i was right.

im kiddin man im not sayin that but it seems you just explained exactly what i was tryin to say. 1- the actual laptop matters more then the chip does when it comes to battery life, and 2- core2 can maybe/probably give you 30min more on a charge so people can take that for what they want.
i suppose by your explanation that we could base the difference on what the person is actually doing with the laptop then. word processing, internet, regular stuff there will probably be a noticeable improvement for battery life with core2's, but for heavy use forget about it- just buy whatever tickles your pickle.
my only problem with centrino was it pretty much sucked in my t40, and, my 1501, without centrino crap, works TWICE as good. easily, and thats not just sayin. i get better range, cooler running and worry free use out of the dell. the t40 was a mess, especially when i tried to swap out the wifi card (youre definitely right, EVERYTHING has to match perfectly

) im actually much happier knowing now there are a wide range of cards i could use for internal wifi, as i saw literally no real world benefit to the centrino package anyway.