Question - How do you flightplan extended spousal cross-country flights?

[B2C2]

I also have an RSTOL kit installed. I don't pay a lot of attention to IAS typically. I usually cruise at 28 in, 2500 RPM, and 9.5gph. This should be around 72%BHP. I flight plan for 197 mph TAS at 17,000, 185 mph at 10K, and 170 mph at 5k. I find I usually come pretty close to those values in cruise. Crossing the mountains I usually fly at 17K ft. Once I am past the Rockies I usually fly around 10-12K ft. The onboard oxygen system works and I have pulse Ox units from mountain high aviation that are super stingy due to on demand delivery. With these I can fly back and forth across the country on one fill, although I bring along a spare cylinder just in case. Pulse delivery also makes it much easier on the sinuses.