I would say more fuel for a given power output. Cold fuel in cold air does
not vaporize and burn as well. Therefore it takes more fuel to produce the
same power output. I suspect this effect is more than offset by the
aerodynamic improvements of wing and propellor in the thick air.
"john smith" wrote in message
...
Here is a question to challenge your understanding of engine operation...

During Winter in the colder climes, do you use less fuel when you fly
because the air is more dense?