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Though, Bluetooth is VERY power hungry despite being much lower powered.You can simply disable 3G, and the phone shouldn't look for 3G(saving you that engergy). The will hunt for 3G if the option is on, but it can't hit a 3G tower.
2g vs 2G is like comparing Wifi to Bluetooth. Wifi is faster, and will use more processing power, while the other does not.