I've tried all stock, stock with custom kernels, custom roms, custom roms, using other browsers and with and without auto brightness. I am pretty certain at this point that this is a hardware problem. Nothing about the stats point to a screen on drain of this rate.
My question is, is this a known problem? Do you think LG will replace it under warranty?
I recently bought a used G2. It was bought on carrier January this year, so it is not exactly old. The problem is that I am getting absolutely horrible battery, sometimes worse than on my Nexus 4. I bought this phone mostly for the great battery life it is known for. My standby time is great, but my screen on time is mediocre. The screens should suffice to shock you.