All engines have an optimal operating temperature. If you are above or
below it, the efficiency is likely to be lower. It's probably not a
big effect.

On Feb 3, 10:32 pm, "Jim Macklin"
wrote:
more if you produce more power, the same at same power.

"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?