Planning it to 3 digits is fine, but expect large variations vs. what
actually happens. It's a long trip and weather will likely be a factor
in at least one direction.

Having made similar trips many times in CD-939, I'd be surprised if
you would go west at 10K feet. That is seldom the optimum altitude
when going into a headwind. In fact, once in the mountains, it is
often
impractical to go IFR because they force you so high. You will also
find
that in many areas in the West that they make you fly well above the
MEAs even on victor airways. Complaining doesn't help.

So you experts: Can you demand to fly at the MEA? Often ice is
a determining factor. Really hoses up your planning.

And do use the O2. You are more goofy after some hours at 10,000
than you think. That's called euphoria.

Sante Fe is a great destination. It's over 6000 feet, so be sure to
check performance.

Bill Hale