I prefer to use 'Color Burn' instead of 'Color Dodge', I think it has a better look.
I also tried doing the Window Tint and Rim Color aswell and it turned out well.
Great tut! Thanks for posting, so simple and easy but has a great effect.
Here's my Merecedes-Benz SL65 AMG Black, please comment.
Here is a second, I think this has a better color choice.
To do make the Gradient just paint the car as the Tut shows, then Magic Wand the area you wanna Gradient and select your 2 favourite colors and use the Gradient tool until you get a look you like.