You need to use the performance tools to see memory usage. You can see how much is used by all the apps running on the device. Also look in the console for messages about memory usage.
My observations are these. When your app gets memory warnings the background apps are also getting them. The OS will kill some of the background apps before it kills your app. Springboard can increase in size also and I think it won't be killed.
The main point is that you need to make your app run in a small footprint and respond well to memory warnings. You obviously have no control over other apps. Some game vendors tell their users to reboot the device before running their app but this seems cheesy to me. If your app is using too much memory simply by pushing and popping view controllers then that's a problem with your app.
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