does gas caps leak usually? gasket go bad ever? I filled up my car the other day, I didn't over fill. i stopped when it clicked as always. Today when I made short trip I smelled gas, looked inside the gas door and some gas. wiped it dry.. went driving around and again more gas. I thought it was just full but its now down 1/8 of a tank after driving 30 miles, and still leaking. HELP!
cars os 1996E320, 106000 miles. thanks!
... and no CEHECK ENGINE LIGHTS!

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1996 E320- 18" Chrome AMG, Bling Bling Mirrors