Difference in standby battery life for 3G on and off?

I have an iPhone 4. I was wondering if there would be a difference in the standby battery life if I left the 3G on compared to turning it off?
I know there is definitely a difference in talk time, but the Apple website doesn't say if there is a difference in standby time.

Well all i can say is test it out. Try turning off 3G and use Edge for at least a day or until your battery drains, record the standby time. Recharge your phone to 100% and and this time turn 3G on and test it.

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