Thar's not ‘saving on energy’ - not very ‘green’ of them.
At the same time - how much money does the gov't want to spend to get Internet cable out to the rural folk? (Of course, they could then monitor their activities, contacts, etc...which snail mail use doesn't provide. (see my tag line)
Typically when these little offices are shut down the delivery burden is shifted to rural letter carriers ~ most of whom are already traveling by your home or place of business. Or, you could be added to a NCDBU or comparable situation.
Why that would change the miles driven to get your mail is a good question. Please 'splain.