Trying to remember everything, been messing with it quite a bit. The battery thread is on this site.
Installed Battery Bar Pro to use the discharge rate as a reference point, at idle with screen brightness set to 25%, discharge rate is 1832 to 2090 mw, that is about as low as I can get, this is with wifi and Bluetooth on with surface pro mouse active, surface type keyboard attached. also about the same with airplane mode on.
Stopped indexing, disabled windows search service
Disabled start-up tasks that I don't use
Turn off notifications
Run Powercfg options, look for problems
If I think of something else, I will add.
Wow! That's a lot of stuff that you turn off!!!