This is good question, I will love to know the result as well. 
But I think exterior color have more effect on the interior temp more than interior color. So my guess will be SILVER exterior color will have cooler temp in summer. And, SILVER is my color!!
But I think exterior color have more effect on the interior temp more than interior color. So my guess will be SILVER exterior color will have cooler temp in summer. And, SILVER is my color!!
