I gotta call you on this. With pretty decent use, this is not possible on the 4G. Standby, I have gotten that. Also by jumping on wifi where available, etc. However, simply using the radio and pretty decent use...not possible.
standby, I can do way better than 30 hours on my Evo. With 3G off and connected to wifi at work and home (and minimal usage, hence standby), my battery drains 12% in a 24-hour period. This is a testament to me having eliminated practically all radio and CPU usage that might otherwise happen while I don't need my phone.
The problem here is "pretty decent use" is purely subjective. And my brief use of my camera or GPS Nav might not qualify as heavy use, but it very well might use more power than someone texting and browsing for a few hours. So without actually laying out what exactly was done in those 30 hours, one cannot "call BS" on it based on a totally undefined standard of usage.
Ok, somewhat back on topic:
One of my concerns about dual core had been battery life, and after reading these reviews and only taking in the objective parts (what the reviewer did and what the battery life was), I'm convinced that
I will be able to get at least 3 days without charging based on
my usage patterns. I say this because on most days, I can get 2 days in on my Evo 4G without charging, and if I were to perform the tasks in the review on my Evo, I would not get such good battery life as the 3vo did.
It would seem that whatever efficiencies that dual-core processors are offering do not require a sacrifice in battery life, and this is a really good thing. It almost feels like there IS such thing as a free lunch.