Thanks for the heads up. I believe standby on LTE also drains battery faster than previous generation (3G/2G).
If you read how apple test the battery here: Apple - iPhone - Battery Test Information
If you notice, they always have wifi connection active and connect to a network. This will disable the overhead when your phone need to increase power to attach to cell network.
Regarding 4G can surf web longer than 3G is due to 4G will download faster. This will bring the CPU time down as once fully loaded, CPU will go to deep sleep (for non animated page, if animated pages, it will keep active)
If you read how apple test the battery here: Apple - iPhone - Battery Test Information
If you notice, they always have wifi connection active and connect to a network. This will disable the overhead when your phone need to increase power to attach to cell network.
Regarding 4G can surf web longer than 3G is due to 4G will download faster. This will bring the CPU time down as once fully loaded, CPU will go to deep sleep (for non animated page, if animated pages, it will keep active)