Unless you have a speed problem, I probably wouldn't worry about it. Yes, it will be faster - not twice as fast, but faster than it is with four bits.
Added complication of changing the hardware, and supporting differnet interfaces have to be weighed against the value of the gains.
Not that I wouldn't do it "at all", I just wouldn't do it if you don't have a speed problem. (BTW: Battery life IS a speed problem)
-Denny
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