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Originally Posted by CGameProgrammer
I don't know. I know the reason the hybrid's gas tank is a gallon smaller than the regular car's is because it has extra protection to seal in fumes, helping it achieve the PZEV rating, and that's why the PZEV first-gen HCH had a smaller tank than the ULEV (lean-burn) one. And I seem to recall that topping off does allow fumes to escape, and unburnt gas is not healthy.
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I thought topping off causes fumes to escape while you're fueling. If you don't have the nozzle all the way in when fueling the vapors cannot be captured by the pump's mechanism. It also causes inevitable little spills.