I've owned my Twin Comanche for five years now. Cost of ownership,
lately including hangar (a very big and very nice hangar with air
conditioned office), insurance, engine reserve, upgrades, and catching
up on all the maintenance deferred by the previous owners - but not
including cost of capital has been steadily creeping up from about
$100/hr (when it was tied down and fuel was $2/gal) to about $150/hr
(hangared and $3+/gal fuel). That does not include costs of capital,
or the cost of my time.

During that same period, the cost of the rental Duchess at my field
(which is not quite as roomy, much slower, and not as well equipped)
has gone from about $160 to over $200/hr. Flying 200 hours a year, I
am consistently doing better than renting.

Michael