[palmer]

all things being equal, both light and dark vehicles, of the same make and model, will heat to the same point

...if both are parked in the shade.

[IYAS9YAS]

...if both are parked in the shade.

Trust me on this. I live in NM, have lived in southern Idaho (over 100 degrees in the summer), and Arizona. I have owned both light and dark colored cars. It makes no difference. They all get hotter than hell in the summer when you park them in the sun.

I guarantee you that any color of car, when parked in the sun, will reach more than 125 degrees at the dash when temps go over 95 degrees outside (I've seen higher). You're gonna use the A/C, regardless of paint color.