Your claims are absolutely absurd, the 11 Pro has a much better battery than your XR yet no one claims such bogus battery usage stats as you. The 11 pro doesn’t have a 2 day battery life, if it was unused in standby then it might be possible but if the phone is actually used then no way will you get through a day without having to charge period.
You can get almost 2 days with light usage on the 11 Pro and more than 2 on the Max.