Originally Posted by BlazeRex
Should be. Don't forget you're also moving more air in colder months. Comp's may increase, but so does load. Which decreases timing
I still bet there is a slight difference in fuel quality for different months. How much, that I do not know
That is true. I can achieve higher loads in winter months which puts me in map areas that I would not hit in the summer. But, this is something different than what I was referring to. I was comparing load for load, meaning, that if you're hitting the same load in the summer and winter, the cold air will allow you to run more timing at that same load. If you're looking at it from the max load standpoint, than yes, you'll have to cut the timing but you're at a different load at that moment which is not an apples to apples comparison.
Anyways, we can see that people have different opinions on the matter. There's really no best seasons for tuning. I have done it in all 4 seasons and it's really not easier or harder to do it in one vs. the other.