Good air, let me tell you about good air. Last week at VMP, track elevation 195ft:

65ºF
27% Relative Humidity
29.94"Hg
1.35 sixty, 9.80 at 135 mph....

Last fall at my home track (MIR), 80ft elevation:
45ºF
37% Relative Humidity
30.59"Hg

Mineshaft conditions!

1993 Daytona, 5.50 at 130mph (1/8) 1.19 sixty ft (PG). Link to 572 B1 - Part 1