Ben Jackson wrote:

For a non-turbocharged piston airplane, does cruise altitude really
matter?

I have never seen a case in which a spreadsheet such as yours would have been useful.
My cruise altitude has invariably been selected by considering airspace restrictions,
winds aloft at different altitudes, or turbulence. Nothing else. If my wife is in the
plane, the factor that comes into play most often is turbulence; when she's not with
me, it's wind.

George Patterson
If you want to know God's opinion of money, just look at the people
he gives it to.