If I was finding that I am spending too much energy checking my mail for a letter, I don't presume that it takes me more energy to check mail than it does for m

If I was finding that I am spending too much energy checking my mail for a letter, I don't presume that it takes me more energy to check mail than it does for me to send it. Rather, I presume that I'm choosing to go check my mailbox too often. That is literally all I am saying here. Your logic on why that is, is effectively my assertion on why someone would find that transmitting devices are easier on the battery. People build the device thinking "the message could come at any time, so we always have to check." Stop doing that, and you go easier on the battery. That is all to say, yes? We appear to be in fairly solid agreement on why a receiving device uses more battery. Has nothing to do with one being more battery per byte sent/received. Has everything to do with whiffing on many more receives than you do on sends. And is in complete control of the person building/operating the device.