Can't say I've noticed, I'm certainly not getting anywhere near the 7+ hours of reviews but I am doing between 5-6, I don't use min brightness, think I am at 4 but have it configured to dim on idle and shut screen down after 1 min.
Flash games shouldn't be taxing your CPU, though they will be running on the GPU
See what else is running, probably have a process using CPU (make sure you show process from all users) on a new laptop all the updates are quite taxing initially like the dotnet stuff, after its installed it proceeds to do a lot of stuff to your machine in the background when using it.