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Continental extended the recommended TBO on the IO-550G (and others) from 2000 hours to 2200 hours on new and factory rebuilt engines. See SIL98-9C here http://www.continentalmotors.aero/uploadedFiles/Content/xImages/TBO Page SIL98-9C.pdf part of Continental's decision was based on this: " TBO periods were established on most CMI engines beginning in the 1960s. Since that time, CMI has made significant engineering improvements to virtually all major engine components. CMI has refined manufacturing processes and implemented computer numerical controlled (CNC) machining tools enabling CMI factory engines to meet higher standards than possible when CMI engines were originally granted FAA Type Certificates. These improvements have enabled CMI to increase TBO limits for many of our new and rebuilt engines." In addition, engines run consistently more than 40 hrs per month will add an additional 200 hours for a total of 2400 hrs. TBO. This statement along seems to suggest frequent, steady flying is good for your engine. This change and the philosophy of MIke Busch on engine management makes a good case for continuing to run the IO-550 beyond the long established 2000 hours many of the currently in service engines are operating on. Has anyone considered these changes when looking at used airplanes with high time engines "near" the traditional 2000 hr. TBO ? What premium, if any, should an owner expect in pricing their airplanes with these engines?