gman wrote:
Hello All,
Where I fly, the density altitude on the tarmac is typically more than
7000ft even on cold days (9000ft on hot days). As a result, non-turbo
engines cannot develop any more than 70% of rated power.


TBO is advisory only for non-commerical operators. Flight school
aircraft that are flown and maintained regularly, even down here
at sea level, typically will make TBO without working hard. We
had a skyhawk here that was still going strong at 2400 hours SMOH.
It had spent the first 2000+ hours as an Embry Riddle plane and
then the next 3000+ or so in a well-run club. It's still flying
traffic reports in the DC area.

Most privately owned aircraft that fly 100-200 hours a year aren't
going to make it to TBO without a lot of luck.