Quad Core MBP saving battery life by only using two cores

I am trying to use my MBP 8,2 with two of my four cores shut down in order to preserve battery life. Is this at all possible through 3rd party apps?

This whole thread reminds me of some of the nutty ideas American carmakers came up with during one of the first gasoline shocks back in the 70's. Don't remember whether it was Chrysler or GM, hellbent on keeping their huge gas guzzler engines, came up with the idea of disabling one or more cylinders when "not needed". A totally Rube Goldberg-ian contraption ensued, more prone to failure than any potential gas it may have saved.
And while on topic and following Señor Grant's lead, last Wedneday decided to take my MBP to the edge. 8% battery charge remaining, that is. That took the whole of 7:15, while running at 50% backlight, WiFi, MS Word and two browsers going (all four cores, too). Then on Thursday 10.7.4 + Safari 5.1.7 came out. So, back to the drawing board on Friday. 7:20 and 6% remaining, got tired of waiting and all this mine is bigger than yours BS and plugged it back in...

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