re: None of the battery life scenarios that Apple showed are sustained workloads consuming peak power.
On a quick google I believe about four hours is the most life one gets on an iPhone 5 with a complex 3D game. Of course a lot of the power there would be used by the GPU. The boards recommend a battery pack if one goes in for a lot of gaming.
If one is really interested in power saving there are lots of ways. For instance the 64 bit ARM instructions were designed to help with turning off the top 32 bits of a 64 bit register when only 32 bits are being used.
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