Well it happened. 39,000 miles and out of warranty the SES light came on. Took it to the dealer and learned that "topping off" created the problem. He showed me the read out on the nifty hand held computer. The sensor in the fuel filler neck? can only take so much topping off. The dealer reset the SES and believes that everything will be ok but warned me to not "top off"

I believe that in this case the SES light would have gone away on it's own after a few days of driving.

As per Cyclemut in a different post:" If there is fuel in the evap line, it won't magically disappear. It will have to be pulled off and drained. It's in a line that doesn't feed the engine, only sensors."

It will "hopefully" go away on it's own but in some cases doesn't.

i had a thread on the same problem, the light finally came off when the low fuel light went on.