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I actually run custom shiny-aluminium window panels in summer on my Renault during summer. Makes a huge difference.
To make them, I took windshield-reflective-screens and cut them and mounted them on cardboard then sealed them with duct-tape. They'd clip into the rear windows to block out the heat. They'd unclip when not needed as well.
I got a temperature difference of 20-degrees c. Meaning that I can keep the interior under 30-degrees-celsius when the outside temperature is 47/48-degrees C. Yes it did get that hot last summer.
Just drove around like it wasn't even hot.
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2003 Renault Scenic - 30% more power with no loss in fuel economy.
1991 Toyota GT4 - more economical before ST215W engine-swap.
previous: Water-Injected Mitsubishi ~33% improved.
future - probably a Prius 
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