I recently read somewhere that white cars with light colored interiors are around 20 - 30 degrees cooler inside than black cars. Something about white reflecting heat better than black.......I dunno, I'm no expert....

This is actually true. Black (or dark colors) absorb radiant heat from the sun and thus have a higher surface temperature. The side-effect is higher heat radiated into the interior of the vehicle.

The same thing applies with dark vs. light colored interiors. Window tinting and a reflective sunshade for the windshield helps a LOT.

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Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]

Generally, a white car is much easier to see by other motorist at night than a dark colored car.