emissions on california class c's

I understand what you are saying about not being too concerned about fuel mileage, Klutchdust. My thought was, the smog pump is probably belt driven so I wondered how much it affected fuel and maintenance cost. Does the system have to be cleaned periodically, does it put the same load on the engine as the ac compressor? We are just starting our search and I am not at all familiar with the V-10 emissions, so just trying to get as much information as I can before writing the check.