As for tipping for valet. I generally go with the $2 as I leave them my car and $2 when I pick it up regardless of what car I drive.

I don't believe there is any type of image you have to project just because you drive a benz. As a matter of fact, I think people who drive a benz will probably tip less. That's why they can afford to drive a benz - being frugual.

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95 R129
04 Infiniti G35.5 BS
10 X204