Watch if it changes in a day or so. A brand new Windows install runs all sorts of updates and stuff in the background. It’s also going to make inconsistent estimates without much history of power use to factor in.

Brightness makes a big difference. Most battery tests are at like 150 nits. The framework can go a lot brighter than this and a lot of people actually like and use higher brightness. Unfortunately at 400 nits the screen starts consuming more power than the rest of the system, your battery life isn’t going to be great, and the efficiency differences between platforms is going to be less noticeable. Testing a full brightness would also punish laptops with brighter screens which is actually a nice feature to have, which is why most reviewers don’t test this way.

If that’s an AP you mean you are getting those speeds over wifi? That’s very good.

Are you sure you aren’t confusing megabits with megaBYTES?

A file transfer in Windows generally shows progress in megaBytes. There are 8 bits in each Byte. 1000 mbps would equal 125 MBps except there is some overhead to run the network, error checking, etc, so roughly 100 MBps is about the max you should realistically expect from 1000 mbps networking equipment.

As for wifi, wifi sucks. The advertised 1750mbps is an aggregate total for multiple clients with each client using multiple channels (not all wifi devices support that) and different clients on entirely separate bands, which cannot be used by the same client at the same time. So any individual device will never get close to 1750mbps. In fact the raw throughput of the entire network in real-world use with lots of devices still won’t be 1750mbps because the entire router only has a 1000mbps link via Ethernet to the internet or the rest of your network. You would need a cherry-picked situation of some clients talking to other clients across the wifi but not to the internet or wired devices to get close to 1750mbps, basically, you can assume that the wifi speed listed on the box is not something you will ever experience.