Well the only thing I have seen is the temperature and humidity and altitude are harder on the cars...
But I also think there are cars that make tons of power, that don't let people know about it wether it be all motor or turbo, they keep it down low.
It was 95 on the dyno saturday, and I let my car cool for about 10-15 minutes inbetween runs and it picked up around 20-40 wheel depending on how long it sat between the pulls.
Trust me James in mid summer it gets almost as hot in NY as it does here. And its just as humid.
R.I.P. Booga
"GA sucks the power out of cars w/ magic."