"Jose" wrote in message
.. .
In my experience, I get higher TAS at altitude. For a normally aspirated
single, 6-9000 feet or so.

At cruise power, yes. As far as I know, you get more loss of thrust than of
drag (due to power loss) above sea level, so at full power, TAS always goes
down from sea level (for normally aspirated engines).

Just as xerj says.