Looking for real data

["Dupree, Robert A." <rdupree@sidley.com>]

As per a request from my father who is moving from Michigan to Desert   
Mountain in Arizona; I would like to know if anyone has access to real   
data concerning the differences in cabin temperatures between a white and   
a black car.  He is currently looking for a new sedan,and the A8 is in   
his top three, although he is underwhelmed by its overly sedate looks.   
 Anyway he likes black but needs real data to convince my step-mom that   
it's a practical purchase...  :)  Also if anyone knows of a WWW source   
for searching the best and most aggressive dealer for car purchasing.
Bob Dupree
'87 5000CS Quattro