Apartment dwellers can do lot as well. For instance:
1. get rid of that car (probably not a reasonable option at this stage for most of the people who live in single-family homes)
2. get rid of that freezer and eat real food instead
3. wear sweaters and turn that heating down (your neighbors will heat you anyway)
4. cut down on the washing

When energy rationing starts, people will have to do a lot more. However, the savings that you propose hurt, i.e., people won't agree to do those things, unless and until they absolutely have to.

I only propose savings that I would consider myself, i.e., things that make sense here and now, either economically, because they pay for themselves within a reasonable time frame, or because they increase my independence, i.e., raise my level of preparedness for the harder times to come.

Yeah, my comment was flippant but these are also things I have considered for myself.
Different people are prepared to do different things.

Keep in mind it's not a choice for everyone either. It would be swell if those who have choices made them so as to make it easier for those who don't but that's not likely to happen any time soon, is it?
I would welcome rationing actually. What I'm concerned about is the over-privileged pricing out everybody else.