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1x means s-l-o-w data, not no data...
1x will still do a data connect, only at low speed...
I would guess power usage is greater when in 1x than in EVDO if you do any data connections... (You are connected longer to download the same amount of data with additional overhead, so use up more power than if you downloaded the same data at high speed...)
I'm not sure if you will see a difference in power usage if you don't use data...
I would also turn off ROAMING as that seems to suck life out of my phone... (Of course, it could be the data roaming at 1x doing it...)
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