Hourly cost figures for GA planes

Greetings everyone,

Our club is looking into expanding its fleet. Most of the fixed costs
associated with an airplane can be obtained from the insurance company and
your favorite A&P. I seem to remember a website that published the
operating costs associated with a great number of GA airplanes. Does anyone
remember the name of such a website or do they have their own favorite
source of this kind of information.

Thanks in advance for your assistance,
Kevin