You're talking about single watts. How much power does your household use (electricity and other)? Does your household use little enough that 30% extra for the

You're talking about single watts. How much power does your household use (electricity and other)? Does your household use little enough that 30% extra for the phone is "a lot"? Do you have a car, what model, how many cm can you drive it on the same amount of as 30% of one phone charge? Please focus on what matters.