How much more data does the iPhone 5 use than the iPhone 4 & 4S?

I'm considering switching from my old phone to iPhone 5 and I need to know how much more data I would be using. Also if anyone knows how much a month the data would cost for an iPhone 5 that would be helpful. (I use ATT&T)
Also any opinions about iPhone 4S vs iPhone 5 just so I can compare the two

I don't think any extra data will be used. But i know that the iPhone 4s isn't that different to the iPhone 5. The iPhone 5 has a larger screen and is faster by a second sometimes its just a small update i suppose. You don't even see the difference between my iPhone 4 to the iPhone 5, just speed difference.

Data will be the same price

The two key differences between the 4S and 5 are the internet speeds, and the size. The 5 is a bit taller than the 4S, which i think is useful. As for the internet, the 5 can receive 4G LTE data speeds, which is as fast as your computer. Unless you want to save money on the phone itself, I would go with the 5.