Overfilling theory (input needed)
Mind you, this is only a theory that I would like the general opinion from Fuelly users, who tend to be more mpg driven and conscious than the general population.
As the adult son of a 40+ years mechanic, who also tinkers in his own cars, I completely understand why overfilling the gas tank is a bad thing. But it strikes me that it would only be bad on an everyday scenario, and specially if you overfill the tank and then park your vehicle for several hot summer days (please don't do that).
My theory is: If you are about to take a looooong road trip, lets call it El Paso to San Antonio, If you overfill your fuel tank as the last thing you do before leaving town, wouldn't the "extra" fuel you are carrying be used-up before it has a chance to evaporate, and since you are driving at highway speed, the catalitic converter would be able to burn off any additional fumes as it is intended to anyway? Also on said road trip, wouldn't you be able to get some additional range?
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zeusstx 
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