iPhone 4 vs. 3GS - Storage size difference(s) ???

Have had a 3GS and an ipad. Got a (used) iphone4. My music playlist is 9GB.
First odd item is that (both running 4.1) the 3GS storage capacity is listed as 14.3GB while this iphone4 lists capacity @ 14.01? Is that normal? I tried activating the iphone4 first using the itunes backup from the 3GS and then after a full wipe activating it as a new phone. Both times were identical @ 14.01 capacity.

Second even more odd thing: the 9GB playlist I mentioned. That is its size in itunes and on the 3GS. When I loaded it to my ipad (running 4.2.1) it took 9.1GB... no big deal. But when I synced with the iphone4 it suddenly swelled to 9.6GB???

Anyone have any idea what is going on and how to get back that nearly a GB (well, .9GB) between the 3GS and the iphone4???

/BD

TEG said:

Each new feature of the phone requires more space for the OS and Firmware. So you loose a little more space with each new version of iOS, and for each new feature added to the phone.

Click to expand...

Yes - that makes sense... thanks.

What (for me) still doesn't make sense is why a specific music playlist that is 9GB in itunes & on a 3GS is taking 9.6GB or 600MB more space on the iphone4?

/BD