It sounds like this discussion started as a commentary on all costs to RV full time (or at least much of the time) but quickly concentrated on electricity costs.
I use my computer a lot and it uses about 1-2KWH daily. I don't need A/C but do have a fridge, lights, etc., for maybe another 1.5 KWH daily (say, 3 KWH total - this figure is roughly similar to what I used in a house averaged over a year). I could cut my electricity costs by getting a laptop but the cost for the good one I 'd need is not really different from solar array and battery upgrades to power my current desktop (which is paid for and has a much bigger screen! 🤗
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I live in the RV, so I can either run the generator a lot with it's high fuel costs and noise, or I can use solar power (or drive a lot at maybe 6 MPG - hmmm, if I drive more I have less time to use the computer and that would cut my electrical costs!).
LED lights are a relatively inexpensive way to keep things visible. I can actually have enough light in the bathroom to see what I am shaving off! And I can see what I am cooking, rather then a darkish mess moving around in a pan (no good bathroom or kitchen lighting, despite "lights" and windows). And cleaning becomes easier because I can see the dirt.
The fridge is a major power user but propane can at least substitute for electricity. Most RV fridges still have terrible efficiency. And propane in many places is not cheap.
There are at least a couple of ways to improve fridge efficiency with various YouTube vids out (thinking Danfoss and higher efficiency aftermarket replacements). I have not seen anything yet about using a very efficient home unit but the newest ones mostly blow air around instead of using freon in hidden tubes in the walls - it's still much of a KWH daily. I'd like to see some test results in RV's.
Fans and water pumps are usually reasonably efficient, although correct placement of them can really improve efficiency. A fan blowing hot air down is a bad idea unless some very strange air movements are required - natural convection wants warmer air and water to rise. That's why the propane fridge efficiency improvement fans are at the top of the the fridge air channel and blowing up or out instead of the bottom.
All the above is really only considering electricity costs (if you are in a park, you are spending far more on that than what this thread is probably about).
Another cost is dumps and refills of water, etc. And there is insurance, and maintenance of your traveling earthquake... There are threads on those in other IRV2 forums, so go look those up.
The only real magic wand regarding RV costs is to just have enough money.
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