Thank you for the good ideas. I learned some things! I'll comment on things that I'd do differently...

A gas stove is generally more efficient than an electric.

I have fans in the bathrooms, but they're not necessary if I'm trying to shave every bit of energy usage. Each of my bathrooms has a window, and I also light matches/candles to eliminate smell.

I use more water with low capacity toilets because of multiple flushes every time. If I could do it again, I'd have full capacity toilets in all my bathrooms, without a choice of low capacity.