We've been in TX almost 20 years and we refuse to purchase a dark colored car with dark interior.
I have a sport Mercedes that is white with very very light colored leather interior and tinted windows. I can't believe how hot that gets if I am out. I keep the sun roof closed as well this time of year. I opted for the non convertible version of this car because the only available convertible tops were black. This one is only 2 yrs old and about 10,000 miles
We also have a little red miata with light leather and we looked had a hard time finding on with the tan convertible top. We would not have purchased one with the black top. We don't drive this much, just in the parade once a year and I take it around the block about once a week. It is 8 yrs old, perfect condition with less than 9000 miles.
Our Town and Country is white with beige leather. Don't drive this much either, 11 yrs old and less than 60,000 miles. Great shape though!
Our company car Jeep Cherokee is dark blue with tan leather. The Company car is the hottest and the darkest we have ever had.
Probably TMI but that is what we have and why in the Texas heat.