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Originally Posted by george d
On my 2000 ML 320, I have found that I can get at least 2 more gallons in the tank after the first shut off, if I fill the remainder very slowly. I have never noticed any gasoline leaks. I like the extra range that the additional gallons give me before the next fill up. I have never noticed any adverse effects. I do make sure the cap is on tightly.
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When you overfill, gas will flood the evap system runing the charcoal canister; also causes excessive rich conditions that will overhead the cat. There is a 10-20% air space in the tank for good reason.