Does switching off the "Setting Time Zone" save your iPhone 4S battery?

The iPhone 4S battery has been a bit fast to burn for many users. I'm considering about getting an iPhone 4S, but before this issue is officially solved, that doesn't seem to be wise.

Does yours burnt out of juice in just a few hours?

Some sources points out that the "Setting Time Zone" function is the key to the draining battery of iPhone 4S. 

Does this apply to your case? Does turning off the functionality help?