You haven't told me how you'd measure an infinite amount of energy. You've only told me how you'd measure the amount of energy in the observable universe. To demonstrate an inconsistency, you actually have to measure something that is inconsistent. This is, after all, how experiments work. Instead, you're using Bushy logic: 0.) Assume that the Many Worlds Interpretation is correct. 1.) Assume that the Many Worlds Interpretation implies infinite energy. 2.) Measure a finite amount of energy in the universe. 3.) By 1.), I have measured an infinite amount of energy. 4.) Therefore, MWI is wrong. Hopefully you can see the gap in the logic here. Everything after `0' is wrong. And note: you don't need gravity or fancy arguments by famous people to show that your objection has no merit.